MOT - engine management light - does it have to be visible?
Discussion
I'm trying to troubleshoot a current problem, 4 sensors replaced so far, each one clearing a specific code apart from one lambda sensor. I've tried two now and the light still comes on. In the meantime the MOT has run out but I could do with be able to use the car.
If you take a vehicle for an MOT and the tester is unable to see an engine management light that's lit, say it's obscured by a sticker or similar, is that an issue apart from being totally council and shameful?
Just trying to think of a temporary work around until I get it sorted.
If you take a vehicle for an MOT and the tester is unable to see an engine management light that's lit, say it's obscured by a sticker or similar, is that an issue apart from being totally council and shameful?
Just trying to think of a temporary work around until I get it sorted.
Engine malfunction indicator lamp
Turn on the ignition and check that the engine malfunction indicator lamp (MIL) illuminates and then goes off. On some vehicles it will be necessary to start the engine before the MIL goes off.
You need to inspect MIL fitted to diesel vehicles with 4 or more wheels and first used on or after 1 July 2008.
Engine MIL inoperative or indicating a malfunction; Major
Turn on the ignition and check that the engine malfunction indicator lamp (MIL) illuminates and then goes off. On some vehicles it will be necessary to start the engine before the MIL goes off.
You need to inspect MIL fitted to diesel vehicles with 4 or more wheels and first used on or after 1 July 2008.
Engine MIL inoperative or indicating a malfunction; Major
https://www.mot-testing.service.gov.uk/documents/m...
Scroll down & you'll find it covers both spark & compression ignition vehicles and relevant dates.
If it requires one & it either doesn't illuminate or indicates a fault it's Major & a fail so covering it up won't work.
Scroll down & you'll find it covers both spark & compression ignition vehicles and relevant dates.
If it requires one & it either doesn't illuminate or indicates a fault it's Major & a fail so covering it up won't work.
He bulb can't be taken out, it's on the circuit board buried inside the sealed dial unit. Of course it could be broken down and damaged but I'm not doing that.
I've replaced both lambda sensors, number 1 twice, and also the knock sensor as that was throwing a code too.
Codes only came up once I decided to sell it 😂
steve-5snwi said:
Whats the fault codes you have & make and model ?
It's an '02 petrol CRV... I've replaced both lambda sensors, number 1 twice, and also the knock sensor as that was throwing a code too.
Codes only came up once I decided to sell it 😂
The fault log is reporting higher than expected voltage from the heated O2 sensor.
It might be worth clearing the fault codes and disconnecting the affected sensor. If the fault remains high voltage, the problem is between the sensor plug and the ECU. If the fault changes tor low voltage, the problem is most likely to be the sensor itself.
It might be worth clearing the fault codes and disconnecting the affected sensor. If the fault remains high voltage, the problem is between the sensor plug and the ECU. If the fault changes tor low voltage, the problem is most likely to be the sensor itself.
Ridiculous MOT rules, an EML covers a range of potential issues, often caused by a faulty sensor. How a faulty sensor translates into a major fault, which should deem it unroadworthy I do not know. I'm convinced it's all political tactics to get older vehicles off the road and more people into brand new cars for whatever reason.
JimSuperSix said:
Graunching_dave said:
zixujo said:
IF. Sounds like you take your cars to the wrong people. My tester would pass it regardless.
Sounds like your tester is a . I don’t want you or your potentially faulty vehicle driving anywhere near me.over-reacting much?
OP, looks to me like you need to be looking at the wiring associated with the pre cat o2 sensor…
Warby80 said:
JimSuperSix said:
Graunching_dave said:
zixujo said:
IF. Sounds like you take your cars to the wrong people. My tester would pass it regardless.
Sounds like your tester is a . I don’t want you or your potentially faulty vehicle driving anywhere near me.over-reacting much?
OP, looks to me like you need to be looking at the wiring associated with the pre cat o2 sensor…
cat with a hat said:
Warby80 said:
JimSuperSix said:
Graunching_dave said:
zixujo said:
IF. Sounds like you take your cars to the wrong people. My tester would pass it regardless.
Sounds like your tester is a . I don’t want you or your potentially faulty vehicle driving anywhere near me.over-reacting much?
OP, looks to me like you need to be looking at the wiring associated with the pre cat o2 sensor…
thetapeworm said:
He bulb can't be taken out, it's on the circuit board buried inside the sealed dial unit. Of course it could be broken down and damaged but I'm not doing that.
I've replaced both lambda sensors, number 1 twice, and also the knock sensor as that was throwing a code too.
Codes only came up once I decided to sell it ??
If its an 2002 petrol then the light being on doesn't matter (for MOT) on your car- for petrol cars from 01 july 2003 and diesel 01 july 2008 only.steve-5snwi said:
Whats the fault codes you have & make and model ?
It's an '02 petrol CRV... I've replaced both lambda sensors, number 1 twice, and also the knock sensor as that was throwing a code too.
Codes only came up once I decided to sell it ??
Warby80 said:
Well look at it this way, the Mot is a basic minimum standard for a vehicle to be roadworthy...
The new rules mean the brake pad warning light being on is a fail despite the fact this could mean there's still twice the legal limit of pad material left.So let's not pretend some of it isn't absolute bks.
Patrick Bateman said:
The new rules mean the brake pad warning light being on is a fail despite the fact this could mean there's still twice the legal limit of pad material left.
So let's not pretend some of it isn't absolute bks.
Wrong, sorry.So let's not pretend some of it isn't absolute bks.
1.1.13 Brake linings and pads
Some brake pads have metal wear indicators so that when the pads become excessively worn the metal indicator touches the disc making a squealing sound. Other pads may have a cut, which if worn away indicates that the pad must be replaced.
No mention of lights that I can see.
As for the over reaction comment, I don't agree that it is, if you are prepared to overlook that which is an absolute fail then what else? fudge the emissions test, that's easy to do, overlook corrosion or broken springs? also easy.
You either test to the book or you are not, if not then you deserve to lose your licence, hopefully the ever tighter assessment will weed some out of the system.
As an end note, I do think the EML illuminated is a tough fail, cars with CAN sometimes flash the light with no relevant problem to the powertrain at all! But it is a fail and so it must not pass the test.
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