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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...

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MOT Questions

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

My Audi A6 has just failed an MOT, down to code 7.1.2brI have an injector which is weeping oil diesel onto the exhaust manifold, where it is burning off and causing a smell. This is not a release of exhaust gases, nor an emission so how can it be an MOT failure

Name: Ed Town: Hull

Code 7.1.2 would be due to an exhaust leak so if you are unhappy with your MOT test you can appeal at a but You need to discuss your test results with the test centre before anyone starts repairs.


My year 99 petrolLPG car always runs on LPG.brshould this be tested as a BET testbrCat test to default limits bror cat test to specific limits brthere seems to be some un certainty brthank you

Name: Stuart Town: Trowbridge

The car will tested for which ever fuel the car is running on when presented for the MOT testbrbrLPG vehicles the hydrocarbons emitted are propane rather than hexane. So the HC reading obtained must be divided by the propanehexane equivalency factor PEF marked on the gas analyser. For example An LPG vehicle gives a reading of 700 ppm. The PEF marked on the machine is 0.48. So the actual MOT value is 700 0.48 1458 i.e. failbrbrSome exhaust gas analysers have an automatic facility for doing thisbrbrCO Under 3.5brbrHC under 1200 ppm

I have seen legislation for car manufacturers that limits petrol cars to 75 do NSA diesel to 76, it also requires government to monitor levels. It seems to me the only government can monitor is via MOT therefore I disagree with the answer that there is no limit, only inspector deciding reasonable.brbrI live beside a road regularly used as a race track late at night and certainly from the noises ai hear, dump valves etc this is not 76 dab or reasonable by any stretch of the imagination.brbrSurely it is time that mot included a d noise level test to clarify this whole area once and for all

Name: G Derby Town: Banbridge

I agree with you about the noise levels. Some motorbikes especially seem to be very loud. The noise level of an exhaust is only a failure if it is deemed excessive andor louder than that of a comparable vehicle. The main reason for exhaust tests is emissions and major leaks. A turbo dump valve is not tested for noise levels during an MOT test

MOT Exhaust

I have a exhaust manifold on my car which doesnt have precats, but I have a sports catalytic converter, will it pass a MOT

Name: Ed Town: Herts

If the car was not originally fitted with a catalytic converter you only need to pass the emission test

Emission warning ligh

I have a warning light stating emissions workshop and believe there is hole in the exhaust will it pass the mot

Name: Jo douglas Town: Essex

The car will be tested for emissions the warning light is not part of the test and can come on for a number of reasons it is advisable to get it checked

Exhaust fixing

Will my car pass its MOT based on my exhaust being clamped to the manifold header instead of being originally bolted The exhaust studs rounded..

Name: John Town: Gateshead

The overall security of the exhaust system should be assessed. one or more exhaust mountings missing may not be a Reason for Rejection a reason for rejection An exhaust system not adequately supported if your exhaust is soundly supported it should pass

Emissions not picked up

Exhaust emissions not picked up on gas tester Advisory info. what that even means

Name: Sim Town: Wakefield

This means that the emissions were so low that the equipment could not get a reading so you were passed with an advisory

Exhaust problem

My exhaust has the smallest hole that sprays a little will it still pass

Name: Matt Town: Alton

Providing the emission is within the required limits and there is no unreasonable sound coming from the exhaust it will pass

MOT Disputed

We bought our 2002 motorhome from a dealer in april 2016 and picked it up on the 2nd june 2016 its mot was done in may 2016 with no advisories. We have had many problems and have had 2 separate independent reports done the first states that the front to rear brake pipe is heavily corroded, both front wheel arches are corroded and holed near to spring mounting,OSR brake pipe is corroded and exhaust rubber mounting broken backed up with digital photos. The second report states front to rear brake pipe dangerous, exhaust mounts corroded and missing. Should this have passed its mot in may and at the least should it have had advisories about the brake pipes etc. We had only had it 12 weeks when we found this out. I know its not part of the mot but there is also excessive rot to the outer floor and sides of the caravan part of the motorhome. All the dealer said over the phone was he needed it back to look at but wasnt willing to collect it. Weve now sent a letter and reports and photos but the dealer has not responded.

Name: Bobby Town: Leeds

There is an official online complaint form that you can use brbra targetblankClick here for more informationa

Exhaust Silencer

I believe my car has 2 silencers, and if i remove 1 of them back box and replace it with a pipe would it still pass an MOT

Name: Jeff Town: Kettering

Providing it meets the emission standards and in the opinion of the tester the sound level is not to high you will pass

Mot Query

Bought a 07 Hyundai 8mths ago 2016 with a years mot, just discovered that breaks have failed on me plus exhaust is hanging off.brAlso looked online at Mot history and it failed back in 2011for a fault with the breaking system.brCould this still be the issue and would the Mot I had picked it up.brI feel that the garage I bought it from have ignored the issues and passed a fake Mot

Name: Berni Town: Cardiff

With the car being tested 8 months ago you would have no comeback on the tester it would be very unlikely that these problems would have been obvious with the age of the car unless it was in pristine condition when you bought it most of these faults could be expected

Scooter emissions

I have a 50CT pulse speedlight 2 but am lil worried to take it for a mot because its smoking a lil out of the exhaust system will it still pass

Name: Mikey cartwright Town: Halifax

Currently not tested

Exhaust mounting

My exhaust is tied up with two wires is is a mot fait the exhaust system on gasses is fine its just the mounting

Name: David Town: Sheffield

Providing the tester thinks that the exhaust is secure and not likely to come adrift you will pass

Minor Exhaust Leak

front Exhaust has a minor leak of exhaust gases 7.1.2brHow much to fix

Name: Wade Town: Dulwich

The person fixing the leak will have to insect it first to give you a price most garages can provide this service

Exhaust Query

125 exhaust has a small hole in it by the baffel, will it pass

Name: Sean Town: Newtown

This will be a matter of the testers judgement if it does not effect the sound or emissions then it will pass but without seeing it cannot give a definite answer

MOT Advisories

Hello, brIm trying to work out how much my MOT will cost in a few months the car has some advisories, such asbrexhaust has a minor leek of exhaust gases 7.1.2, nearside rear brake hose has slight corrosion to ferrules 3.6.B.4e, offside front brake hose has slight corrosion to ferrules 3.6.B.4e and finally corrosion forming on rear axle and front bottom arms.brbrMy car is a 2001 K reg vauxhall corsa comfort in royal blue. brbrAs a lot of the advisories are due to corrosion, I was just wondering if there is anything I can do to stop or help reduce the corrosion problem. brbrI understand it is near enough impossible to predict the exact cost of my MOT, but going on what advisories I have, just an estimate for those would be fantastic. brbrThank you.

Name: Lucy Southgate Town: Gloucestershire

It is not possible to say what the costs can be if there is little or no deterioration in the components then they could possibly pass again this year a inspection by a competent mechanic should give you some sound advice



It is complicated but all the details are

Mot Emissions

What emissions MUST be measured when MOT testing a diesel car registered in 2012

Name: Philip Mason Town: Cheltenham

Emissions are quite complicated DVSA have produced a PDF at gives all the information regarding emissions this will not take into account the current controversy with VW

Catalytic converter

Hello,brMy mot is expiring at 12 August 2015.I booked mot test on 298 as we need the car to go on holidays on 257.The car failed.We fixed what they asked and we booked for another mot test on 137.We failed again at exhaust emissions with CO 0.756.They told us that we need to change the catalyt converter.What do you think I can altelnative do as it will cost a lot of moneybrKind regards,brMatthildi

Name: Matthildi Town: Southampton

The net has loads of offers on cats some research online you should be able to pick one up for sensible money
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