Do MOT failures get recorded?
Failing the MOT If your vehicle fails the MOT: you’ll get a ‘refusal of an MOT test certificate’ from the test centre. it will be recorded in the MOT database.
Why did my car fail the MOT test?
The car has failed it’s MOT on just the CO (carbon monoxide) output. Everything else was OK. The limit set by the MOT Tester was 0.3%, the actual emissions on 2 Fast Idle and 1 Normal Idle test runs were 0.44, 0.44, & 0.45 respectively. The engine was warm during testing.
Why did my Mot fail due to high co?
IIRC the factory default cats are around 400 Cell so there is a potential for the cats to let more emissions through. Just doing a little research in an attempt to understand why/how the CO is high… The MOT tester has access to a DOT database or emissions handbook, which lists the CO and HC limits for each make and model of vehicle.
What should O2 readings be on a MOT?
According to my recent researching CO is minimised at around 15.2:1 or better AFR, though you should be good at stoich, which the O2 sensors should be placing you at. So thats weird. However I know you have recently had long tubes installed and if the o2 sensors are sited further down the exhaust and/or get colder their readings get thrown off.
Can a diesel engine pass a MOT test?
Greater scrutiny is now placed on the health of diesel engines, including visible tailpipe emissions (smoke), the engine management warning light, and the diesel particulate filter (DPF). Petrol cars didn’t escape MOT test changes either, though.
The car has failed it’s MOT on just the CO (carbon monoxide) output. Everything else was OK. The limit set by the MOT Tester was 0.3%, the actual emissions on 2 Fast Idle and 1 Normal Idle test runs were 0.44, 0.44, & 0.45 respectively. The engine was warm during testing.
IIRC the factory default cats are around 400 Cell so there is a potential for the cats to let more emissions through. Just doing a little research in an attempt to understand why/how the CO is high… The MOT tester has access to a DOT database or emissions handbook, which lists the CO and HC limits for each make and model of vehicle.
According to my recent researching CO is minimised at around 15.2:1 or better AFR, though you should be good at stoich, which the O2 sensors should be placing you at. So thats weird. However I know you have recently had long tubes installed and if the o2 sensors are sited further down the exhaust and/or get colder their readings get thrown off.
How to reduce your emissions for a MOT?
Our new Pre-MOT product gives a deep clean to lower your emissions which may help you pass first time. Using our super-strength Pre-MOT in the run up to your test will: