EML On - MOT Hard Fail?
Author
Discussion

NugentS

Original Poster:

699 posts

268 months

Friday 23rd August 2019
quotequote all
All,

Had an argument in the pub last Tuesday. I thought an Engine Management Light was a hard fail for an MOT. The opposition claimed not and that it depended on what the actual emissions were on test.

Assume current MOT rules

[If relevant the car in question was a 8 year old Audi Diesel]

Who was right?

Sean



Edited by NugentS on Friday 23 August 12:54

eybic

9,212 posts

195 months

Friday 23rd August 2019
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I was under the impression that if any warning lights are on, it will fail???????

SD_1

7,278 posts

179 months

Friday 23rd August 2019
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Didn't it change recently so that EML on = fail?

It's a bloody stupid rule, should be done on actual emissions. EMLs can come on for all sorts of reasons.

dogbucket

1,252 posts

222 months

Friday 23rd August 2019
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Buy a £5 Bluetooth OBDII dongle off eBay, link to your phone and clear the fault codes.

SS2.

14,671 posts

259 months

Friday 23rd August 2019
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NugentS

Original Poster:

699 posts

268 months

Friday 23rd August 2019
quotequote all
Thank you

Sean

mmm-five

12,011 posts

305 months

Friday 23rd August 2019
quotequote all
eybic said:
I was under the impression that if any warning lights are on, it will fail???????
I think it's just ABS/EML lights that are a fail - mine passed with a brake pad warning light still on (even though I'd recently replaced all discs/pads/sensors).

Initforthemoney

743 posts

165 months

Friday 23rd August 2019
quotequote all
eybic said:
I was under the impression that if any warning lights are on, it will fail???????
Agreed

SS2.

14,671 posts

259 months

Friday 23rd August 2019
quotequote all
Initforthemoney said:
eybic said:
I was under the impression that if any warning lights are on, it will fail???????
Agreed
Low fuel ?

anonymous-user

75 months

Friday 23rd August 2019
quotequote all
Initforthemoney said:
eybic said:
I was under the impression that if any warning lights are on, it will fail???????
Agreed
Not the case, it's certain listed warning lights. Certainly more than there used to be, but by no means all.

It's all in the MoT test guide if you want to confirm. As others have said, the EML is an immediate fail now the rules have changed.

https://www.gov.uk/government/publications/mot-ins...

Centurion07

10,395 posts

268 months

Friday 23rd August 2019
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Utter utter bullst rule.

As said, EML's can be on for a variety of reasons, some major, some utterly pointless.

I own a private hire vehicle which is subject to an even more stringent version of the MOT Joe Public gets on their car and my EML was on.

Took it to main dealer thinking it was still under warranty as it was under three years old. Problem was it's done 75K so 15K over their warranty limit. Got them to check it out anyway at a cost £69 to plug a poxy OBDII reader in.

Computer said both exhaust sensors either side of the DPF were faulty. That will be £1000 please.

I asked what happens if replacing those sensors doesn't clear the EML. "Well, we'll always look to work with the customer if we attempt a fix and it doesn't work". Riiiiight....but even if you decide to refund me 50% I've still spunked £500 up the wall and can't work as I can't get an MOT because of the EML.

I decided to chance it and took it straight from the dealer, who'd at least cleared the codes and EML, to get the MOT done. Light stayed out, car passed, £1000 saved.

Annoyingly light is back on but for the sake of a grand that may or may not fix the problem, it can stay on until next MOT when I shall just clear the code again as the car is running just as well as it ever has done.

sassanach0

216 posts

253 months

Friday 23rd August 2019
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SS2. said:
you appear to have left this bit out.........

You need to inspect MIL fitted to diesel vehicles with 4 or more wheels and first used on or after 1 July 2008.

similar rules also apply to lpg and petrol vehicles

You need to inspect MIL fitted to

petrol vehicles with 4 or more wheels, not more than 8 passenger seats in addition to the driver’s seat and first used on or after 1 July 2003
petrol vehicles with 4 or more wheels, more than 8 passenger seats in addition to the driver’s seat and first used on or after 1 July 2008
gas and bi-fuel vehicles with 4 or more wheels, not more than 8 passenger seats in addition to the driver’s seat and first used on or after 1 July 2008
Kit cars, amateur built vehicles and American pickups are not required to be fitted with an engine MIL.

Edited by sassanach0 on Friday 23 August 20:22

SS2.

14,671 posts

259 months

Saturday 24th August 2019
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sassanach0 said:
you appear to have left this bit out.

You need to inspect MIL fitted to diesel vehicles with 4 or more wheels and first used on or after 1 July 2008.
Nothing pertinent has been omitted - the vehicle in question is a 2011 Audi.

V8LM

5,484 posts

230 months

Saturday 24th August 2019
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Centurion07 said:
Computer said both exhaust sensors either side of the DPF were faulty. That will be £1000 please.

I asked what happens if replacing those sensors doesn't clear the EML. "Well, we'll always look to work with the customer if we attempt a fix and it doesn't work".
Standard practise. We think it is this. We will replace that.

When it turns out not to be this they still have done what they said they would do.

vitesse2000

369 posts

184 months

Saturday 24th August 2019
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The MIL lit up on my 2004 Honda CR-V petrol years back, scanned it and was a faulty knock sensor, but as it seemed to have zero effect on the car and it was a bh to get to I left it - up until this years test anyway.

Funnily enough, youtube gave an easy way to change it, although that spanner won’t be suitable for anything but knock sensor changing now - weirdly it pinks more with the sensor working, but mpg is better - and it has 162k on it now so probably needs a decoke after the years of supermarket petrol my wife puts in...

anonymous-user

75 months

Saturday 24th August 2019
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That’s a good example of why the new rules exist - EML on due to faulty knock sensor, car defaults to a safe mode engine map which runs a richer mix to protect the engine, hence worse MPG and higher emissions.

Centurion07

10,395 posts

268 months

Saturday 24th August 2019
quotequote all
V8LM said:
Centurion07 said:
Computer said both exhaust sensors either side of the DPF were faulty. That will be £1000 please.

I asked what happens if replacing those sensors doesn't clear the EML. "Well, we'll always look to work with the customer if we attempt a fix and it doesn't work".
Standard practise. We think it is this. We will replace that.

When it turns out not to be this they still have done what they said they would do.
Yup. I'll be damned if I was going to pay a grand for them to play the parts-swap game on MY car though.

As I said, the car runs exactly the same as it always has. I keep every fuel receipt with a note of the mileage & MPG figure and there's no difference there either so there's no way I'm paying a four figure sum to extinguish a poxy bulb.

Retroman

975 posts

154 months

Saturday 24th August 2019
quotequote all
I was in the understanding the the MIL testing was only done on particular cars made after a certain year.
My friend's 2006 Ibiza FR TDi passed with his on (EGR deleted) MOT inspector told him his car was close to the cut off year.

anonymous-user

75 months

Saturday 24th August 2019
quotequote all
Retroman said:
I was in the understanding the the MIL testing was only done on particular cars made after a certain year.
My friend's 2006 Ibiza FR TDi passed with his on (EGR deleted) MOT inspector told him his car was close to the cut off year.
For diesels it’s 1st July 2008, for petrol cars 1st July 2003. Other ages apply to other types of petrol vehicle - e.g. more than 8 seats - or LPG vehicles.

Retroman

975 posts

154 months

Saturday 24th August 2019
quotequote all
charltjr said:
For diesels it’s 1st July 2008, for petrol cars 1st July 2003. Other ages apply to other types of petrol vehicle - e.g. more than 8 seats - or LPG vehicles.
Thanks for confirming that.
Is 1st July 2008 about the same time when DPF's became mandatory, as his has a catalytic converter instead