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These pages contain the word exhaust

MOT Training - NTTA Sample Questions

...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

...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

... 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

...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

...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

...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 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?

...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 ...


...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

...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

...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

...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

...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

... 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

... 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

...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

...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

...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

...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

...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

... 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

...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

...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

...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

... 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

...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

Minor exhaust leak

Rear Exhaust has a minor leak of exhaust gases 7.1.2

Name: Barry Town:

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:

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:

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:

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:

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:

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:

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:

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:

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.

Hole in pipe leading to back box

Hole in pipe leading to back box would this fail an mot br

Name: Jack walker Town: Stranraer

Exhaust holes have to be deemed serious to fail the MOT. A small hole will not fail unless the gases go into the passenger compartment

Motorbike Footpegs

Do you need both rear footpegs for motorcycle not as I have 2rear exhaust pipes on top of each other and the top one is for cosmetic purposes only and one peg on other side only

Name: tony Town: basingstoke

If you have a seat capable of taking a pillion passenger then it must have footrests for this passenger. You could get a cowling to go over the rear of the seat to negate this but Ive heard a lot of stories of MOT test stations overlooking this issue.

Advisory notices

I am going to see a car and I have just checked the MOT history. I know nothing about cars, other than they either move... or dont.brbrWhen I check the MOT It passed, I see that there are two issuesbrbr Test date 11 January 2017br Expiry date10 January 2018br Test Result Passbr Odometer reading 63,240 milesbr MOT test number 5857 0071 1330br Advisory notice itemsbr Exhaust has a minor leak of exhaust gases BACK BOX 7.1.2br Oil leak brbrWhat do the Advisory notice items mean Are they serious The car in question is a PEUGEOT 107 and is selling for 2000.

Name: Richard Town: CAMBRIDGE

Advisory notices are to inform you of defects that could become more serious but are not at the time an MOT failure.

Exhaust leak

front exhaust has a minor leak of exhaust gasses will it pass mot this year


The car would only fail for a major leak.

Flexi Pipe repair

small leak from flexi pipe has been repaired with exhaust cement it was advisory on mot feb 17will this affect next years mot

Name: brian Town: edinburgh

It would depend on which flexi pipe you are talking about. If it is part of the exhaust system then as long as the exhaust does not leak it should pass

Projecting exhaust

exhust projects to the pedestrian side of car is this a mot failure

Name: Allan Williamson Town: Canvey Island

If the exhaust is deemed dangerous to the public Hot surface of protruding sharp edge then the vehicle will fail.

Failed CAT

Hi had an mot done it states pass on its exhaust emissions test but 5 days later the engine warning light came on as it needed a new cat converter. Why would this not have been picked up Thanks

Name: Anonymous Town: Derby

Because the MOT test only tests the car at the time of the MOT. It does not predict future failures. Parts can fail at any time. If the Cat was ok at the time of the test then the car will pass
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