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(post 2012)


These pages contain the word exhaust

MOT Training - NTTA Sample Questions
http://www.ukmot.com/garages/training-questions.asp


...ons 46. When a petrol engine is running rich the exhaust gas hydrocarbon HC will be A higher than it should be B lower than it should be C the same as when the engine is running weak D the same as the exhaust gas carbon monoxide content 47. Petrol is mainly composed of A nitrogen and o...



Car MOT Manual - 7.4 Exhaust Emissions - Compression Ignition
http://www.ukmot.com/manual/7.4/Exhaust-Emissions-Compression-Ignition


...of smoke meter must be correctly aligned with the exhaust gas flow. Reference to the smoke meter manufacturers instructions may be necessary. When testing vehicles fitted with automatic transmission care must be taken to avoid overheating the transmission system. Do not carry out unnecessary engine ...



Car MOT Manual - 7.1 Exhaust System
http://www.ukmot.com/manual/7.1/Exhaust-Fuel-and-Emissions


... Reason for Rejection The overall security of the exhaust system should be assessed one or more exhaust mountings missing may not be a Reason for Rejection. A durable repair to an exhaust system which effectively prevents leaks is acceptable providing the system is structurally sound. A minor exhaus...



Car MOT Manual - 7.3 Exhaust Emissions - Spark Ignition
http://www.ukmot.com/manual/7.3/Exhaust-Emissions-Spark-Ignition


...een modified in any way, it still has to meet the exhaust emission requirements according to the age of the vehicle. A personal import must be tested according to its date of first use. The only exemption to this is if the vehicle owner can present to the tester at time of test a letter from the veh...



Catalytic Converters
http://www.ukmot.com/catalytic-converters.asp


...rters Catalytic converters are part of your cars exhaust system which converts noxious gases from the car exhaust into Carbon Dioxide, Nitrogen and Water. Frequently asked Questions FAQ Q Do I need to change my cat A A catalytic converter can be an expensive item, so you dont want to change it unl...



Most common reasons for MOT failures
http://www.ukmot.com/Reasons%20for%20MOT%20Failure.asp


...trols 0.4 0.5 0.5 0.4 0.4 0.5 Motorcycle fuel and exhaust 1.7 1.7 1.6 1.4 1.3 1.2 Motorcycle lighting and signalling 10.8 11.5 11.8 10.8 11.0 10.8 Motorcycle reg plates and vin 1.0 1.4 1.9 1.5 1.4 1.2 Motorcycle sidecar 0.0 0.0 0.0 Motorcycle steering and suspension 5.8 5.7 5.6 4.9 4.8 4.5 Motorc...



Avoiding MOT Failure - Exhaust System
http://www.ukmot.com/MOT%20test/Exhaust%20System.asp


...st SystemHave your assistant place a rag over the exhaust while the engine is running. Note they are not trying to block the exhaust just impede it Check system for leaks. This will be a lot easier with the car jacked up but if you cannot jack the car up, a leak should still be more obvious when th...



What does a garage look at during an MOT test?
http://www.ukmot.com/garage%20mot%20test.asp


...aust emissions vehicle meets the requirement for exhaust emission. These vary on the age and fuel type of the vehicle Exhaust system complete, secure, without serious leaks and silences effectively Vehicle structure free from excessive corrosion or damage in specific areas. No sharp edges Doors ...



MOT FAQ's
http://www.ukmot.com/faq.asp


...ving controls 0.4 0.4 0.5 Motorcycle fuel and exhaust 1.4 1.3 1.2 Motorcycle lighting and signalling 10.8 11.0 10.8 Motorcycle reg plates and vin 1.5 1.4 1.2 Motorcycle sidecar 0.0 0.0 0.0 Motorcycle steering and suspension 4.9 4.8 4.5 Motorcycle tyres and wheels 3.6 3.6 3....



Vehicle test procedures - Stage 1
http://www.ukmot.com/Vehicle%20test%20Procedures%20Stage%201.asp


...sult in the vehicle being refused a certificate exhaust emits excessive smoke or vapour of any colour, to an extent likely to obscure vision emissions cannot be measured because a tail pipe is damaged or an accessory is fitted which prevents the insertion of the smoke meter probe insufficient oi...



Motorcycle MOT Pre Check
http://www.ukmot.com/bike-basics.asp


...he discretion of the tester, other checks are The exhaust mountings must be secure and not fouling any part of the rear suspensionThe exhaust must not be holed and free from leaks from both joints and boxesReplacements units, other than bikes registered before 01.Jan.1985, must have the BSAU 193 sta...



Avoiding MOT Failure - Emissions - Petrol Engines
http://www.ukmot.com/MOT%20test/Emissions%20-%20Petrol%20Engines.asp


...o return to idle and watch for any smoke from the exhaust pipe. If dark smoke comes from the exhaust then the car will fail and need engine repair or further tuning. Blue smoke usually means oil is being burnt. This usually occurs when worn seals allow oil into the cylinders. Valve stem oil seals o...



Avoiding MOT Failure - Emissions - Diesel Engines
http://www.ukmot.com/MOT%20test/Emissions%20-%20Diesel.asp


...o return to idle and watch for any smoke from the exhaust pipe. If dark smoke comes from the exhaust then the car will fail and need engine repair or further tuning. Blue smoke usually means oil is being burnt. This usually occurs when worn seals allow oil into the cylinders. Valve stem oil seals o...



Avoiding MOT Failures
http://www.ukmot.com/MOT%20test.asp


... the ground and free to rotate. Checks 19 20 Are exhaust and emission checks Internal Checks 1. Handbrake 2. Footbrake 3. Steering Wheel 4. Windscreen Mirrors 5. Seat Belts 6. DoorsExternal Checks 7. Registration Plates VIN Vehicle Idenification Number 8. Electrical Equipment 9. Brakes 10. Steeri...



DPF - Diesel Particulate Filters
http://www.ukmot.com/DPF-Diesel-Particulate-Filters.asp


... vehicle which filters particulate matter PM from exhaust gases. It does this by trapping solid particles while letting gaseous components escape. This type of filter has been in use for over 20 years, and many variants exist. These filters enable reductions in emissions which help meet European emi...



Car MOT Manual - 3.6 Braking Systems and Additional Braking Devices
http://www.ukmot.com/manual/3.6/All-Braking-Systems


...ional braking e.g. electric or fluid retarders or exhaust brakes. I. Additional Braking Devices 1. Examine the device, its contacts and other components for condition and security. 2. Check for adequate clearance between the device and other components. 3. Check for presence and condition of heat ...



Avoiding MOT Failure - Steering Mechanism
http://www.ukmot.com/MOT%20test/Steering%20Mechanism.asp


...PRE MOT CHECKSAvoid a Failure Reasons For Failure Council MOT Centres Handbrake Footbrake Steering Wheel WindscreenMirrors Seat Belts Doors Brakes Shock Absorbers Electrical Steering Mechanism Braking System WheelsTyres Bodywork SteeringSuspension Exhaust System Drive Shafts FuelExhaust Petrol Emis...



Avoiding MOT Failure - Fuel & Exhaust
http://www.ukmot.com/MOT%20test/Fuel-Exhaust.asp


...signs of damage andor leakage. Examine the entire exhaust system for leaks, inspecting all brackets and mountings and making sure all are secure and intact and free from corrosion...



Northern Ireland MOT Test
http://www.ukmot.com/Northern%20Ireland%20MOT%20test.asp


...Northern Ireland MOT TestThe Driver and Vehicle Agency DVA is the Northern Island MOT booking centre this is not the same as in Mainland Britain where you can go into any approved MOT test centre to have your vehicle MOTd in NI it is only the DVA who control the bookings at the MOT TEST Centres, you...



Vehicle test procedures - Stage 4
http://www.ukmot.com/Vehicle%20test%20Procedures%20Stage%204.asp


...ks engine and transmission mounts transmission exhaust system including the catalytic converter mechanical brake components brake hydraulic, air and vacuum systems fuel system spare wheel and carrier general condition of vehicle vehicle structural integrity and construction This list of ite...



Your Questions Answered
http://www.ukmot.com/Your-MOT-Questions.asp


... Answer 3 Q Can a car fail mot with an exhaust cracked manifold Name Zoe grant Town Hfd Reveal Answer 4 Q if I think the m.o.t has not been done to GOV standard and the m.o.t station will not accept this can I take it further Name anthony smith Town SHEFFIELD Reveal Answer ...



Test FAQ’s
http://www.ukmot.com/garages/FAQs.asp


...boy racers in our area who have excessively noisy exhaust pipes, which I consider to be a nuisance. How do these vehicles pass the MOT test arent they illegal QuestionI have been having some problems working out when to use PRS duringthe MOT. I realise that it can only be used after test, but ther...



Training Courses
http://www.ukmot.com/garages/training-courses.asp


...s tyres, electrical systems, body and corrosion, exhaust emissions and general subjects. This assessment will take place at your local VOSA Area Office. MOT Test Cookie Policy TermsConditions...



How to recognise an approved MOT garage
http://www.ukmot.com/approved%20garages.asp


...s must be reasonably free from oil contamination, exhaust fumes, noise or other pollution from adjacent work areas equipment laid out so that testing can be performed effectively. The equipment should be laid out and located so that the other activities of the garage will not affect the proper...



The History of the MOT
http://www.ukmot.com/MOT%20history.asp


... indicators, spotlights, horn, body structure and exhaust systems 1983 MOT test for taxis and vehicles with more than eight passenger seats reduced to vehicles over one year old 1991 MOT test to include petrol emissions, antilock braking and rear seat belts 1992 Minimum tyre tread depth of 1.6mm ...



MOT Manual
http://www.ukmot.com/mot-manual/


...Car MOT Manual 2012 onwardsCar Manual Home 1. Lamps, Reflectors and Electrical Equipment 2. Steering and Suspension 3. Brakes Electronic Stability Control Systems 4. Tyres and Road Wheels 5. Seat Belts and Supplementary Restraint Systems 6. Body, Structure 7. Exhaust, Fuel and Emissions 8. Driv...



26 pages found



MOT Questions






If i put a dummy exhaust on on the other side of my Audi a4 2.0l to make it look sporty. But still have the original existing exhaust in all working order would it still past the mot

Name: Ali Town:





If i put a dummy exhaust on on the other side of my Audi a4 2.0l to make it look sporty. But still have the original existing exhaust in all working order would it still past the mot

Name: Ali Town:





Hi I have my Mini fitted with modified aftermarket exhaust and passed emission test. Is that going to pass in MOT or do I have to replace the rear silencer.

Name: Harmeet Singh Town: singh2512h@gmail.com





I have a year 2000 W reg VW diesel transporter T4. In 2011 I had a new stainless steel exhaust system fitted from the manifold and I believe legally the DPFcatalytic converter was removed to enable a freer flowing exhaust. What is the implication of the new MOT rules on my T4 when my MOT is due in June this year

Name: Robert Iles Town: robertroeschiles@gmail.com





I have just purchased a car with a new MOT. The exhaust has started blowing and when a garage looked at it, they said it has been filled with repair paste and is badly corroded at the catalytic converter and flexi pipe.brShould this have been an advisory on the MOT.brThanks.

Name: bernard. Town: bernard.clegg@blueyonder.co.uk.





Hi, Im considering getting a resonator delete middle silencer removed on my 2016 focus st mk3 exhaust.brbrWould this still pass mot

Name: Ollie jones Town: Olliegj1987.oj@gmail.com



EXHAUST BACK BOX

Will I fail an MOT if I have an aftermarket backbox for my exhaust

Name: Brandon Crawford Town: brandoafc1@live.co.uk

Not in itself, however if it causes any of the following issues, the vehicle will failbr1. The exhaust system is not adequately supported.br2. There is a major leak of exhaust gases from any part of the system. br3. A catalytic converter or particulate filter is missing where one was fitted as standard. br4. A silencer is in such condition, or of such a type, that the noise emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a standard silencer in average condition. br5. Exhaust fumes entering the drivers or passenger area.


Minor exhaust leak

Rear Exhaust has a minor leak of exhaust gases 7.1.2

Name: Barry Town: barryowen89@gmail.com

Minor exhaust leaks are no longer an MOT fail


EGR Valve

My EGR Valves are faulty in my Range Rover Sport. I am being advised to fit blanking plates but this will cause the Engine Management Light to remain on permanently. Will this fail the MOT in 2018

Name: Robert Town: dotman1@hotmail.com

An engine management light will not fail an MOT. The only thing that might be affected is your emissions but this is actually unlikely. An EGR reruns the exhaust gasses though the inlet manifold at certain rev ranges to make sure that all the fuel is burnt. At present its failure or removal is not an MOT fail, as long as the MOT tester doesnt deem it an illegal modification, as the main concern is with diesel particulates and not the NO2 which the EGR is designed to reduce. It would be a jobsworth MOT tester that would fail it


Motorbike Exhaust

I was wounding if my motorbike would pass its mot has it got a sport exhaust just didnt know if they would fail it for being to loud

Name: andrew sheffield Town: pippin16055@gmail.com

Construction and use regulations say that a pipe should not be altered in any way to increase noise, and should clearly and indelibly be marked with either the British standard marking indicating that it has been tested in accordance with test 2 or ii a reference to its make and type specified by the manufacturer of the vehicle.


Exhaust cracked

I recently took my car for a service. And they said my car need a new middle pipe and back box exh. I think they are cracked. Would this make my car fail its mot

Name: Emily Perry Town: emilyroloperry@hotmail.com

If the exhaust was leaking badly or in danger of falling off then yes, the car would fail


Exhaust clamp

I have a Peugeot 207 and its failed the mot on a rear clamp that has deteriorated to the point where it is split apart, there are 3 clamps holding the exhaust up and it is secure but they failed it, does he have a right to fail it

Name: Jamie Riley Town: jamielee2k@gmail.com

If he deems that the exhaust is not adequately supported


Centre exhaust box is corroded

The last 2 MOT on this car I am considering buying says the centre exhaust box is corroded on the advisory notes.brbrCan you explain what this is please x

Name: Jo Gregory Town: booby69@hotmail.co.uk

Exhausts only fail the MOT for a major leak. Obviously a minor leak or corrosion would be pointed out as a possible future problem but at the time of the MOT test it was not bad enough to fail the MOT. I would look at the car with the premise that it may need a new exhaust soon.


Exhaust leak

Would a gas analyser testemissions test on an exhaust system showfail if there was a leak on an exhaustbrbrReason my car failed its MOT on the 19th September due to a leaking flexi pipe towards the front under the handbrakegear stick....this was repaired on the 20th SeptemberbrbrBut the garage have left an MOT exhaust emisions test result receipt completed on the 19th stating overall result...PASS....brbrIf a system is leaking would it not fail an emissions testbrHave I been charged 230 for a part I didnt need

Name: Mark Town: m_thompson29@sky.com

A small leak is no longer an MOT fail. Unless the inspector thought that the gases would dangerously enter the passenger compartment.


exhaust tailpipe missing

hibrbrwould a exhaust tailpipe missing fail an mot

Name: mark Town: markroche50@hotmail.com

As long as it does not effect the function of the exhaust and that the exhaust gases would not dangerously heat part of the vehicle. Dont forget that the petrol tank is usually located at the rear of the car also. If the exhaust gases where to heat this area then it could be considered dangerous


Front exhaust mount is broken

The front exhaust mount is broken on my Peugeot 207. will it fail the mot they said a new centre section and clamps is required on the advisory notes of my service.

Name: K. Rea Town: stretford1973@hotmail.com

The exhaust does not need every bracket as long as the tester deems it secure. one or more exhaust mountings missing may not be a Reason for Rejection


No Back Box

Are you required to have a back box for an mot and is there a set db noise for either the mot or what is legal for police

Name: josh m Town: wakefield

Regulation 542 of the Road Vehicles Construction and Use Regulation 1986 as amended Every exhaust system and silencer shall be maintained in good and efficient working order and shall not be altered to increase the noise made by the escape of exhaust gases. This also means that if the car was fitted as standard with a back box then it needs one to pas the MOT


Exhaust leak

My Honda Element has a corroded and broken flange where the back box meets the tail pipe. As it is an import it seems I cant get a replacement easily. I have wired it together temporarily. Would this failbrThank you

Name: Mike Town: Brighton

Small exhaust leaks are no longer an automatic fail unless the gases are deemed hazardous i.e. enter the passenger compartment. All parts of the exhaust must still be secure.


Detatched exhaust bracket

Detatched exhaust bracket, no support for catalytic converter and it is free to bounce around and knock on the cross member, also flexible webbing around the cat has come adrift ,is this an MOT failure

Name: S.foster Town: Birmingham

Yes The entire system must be securely fixed to the vehicle as intended or it will fail.


broken exhaust clamp

Can one broken exhaust clamp on a car fail its m.o.t

Name: Shaun Town: Hastings

Yes The entire system must be securely fixed to the vehicle as intended or it will fail.
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