Golf mk5 EML on emisions fault.

Bpmull

So my run of good luck with my golf has come to an end today. Worked perfect yesterday on a 200 km trip. First time to start it today started perfect and ran fine but eml is on and all that comes up is emisions garage ! I know it's impossible to diagnose faults on the Internet but I'm wondering is it drivable to a garage I mean.

On a side note yesterday I pulled the headlight motor fuse as one of my headlights is shorting and is noisy but this is hardly related as I didn't touch any other fuses.

It's a 2007 vw golf 1.9tdi 105bhp bxe engine.

Any advice would be much appreciated.

George Dalton

It's fine to drive.

C0N0R

Sorry for jumping on your thread but is this a nct fail??

Special Circumstances

For a diesel I think it is a "refuse to test" and therefore a fail.
Petrol will be tested and may pass or fail depending on emissions if I understand things correctly...

Bpmull

Right I went to the local vw audi specialist where the previous owner used to get the work done on it I never used them myself but they seem good. By the time I had got out the light was gone. He scanned it anyway so there was 5 intermittent faults.

4 were for the 4 glow plugs
1 Air flow mass meter

So he cleared them all started it again rescanned it and nothing is showing up now and it's driving fine was driving fine even when the light was on. So the mechanic didn't seem too bothered he said just to wait and see if the light comes on again.

Special Circumstances

Would one of those bluetooth obd scanners read and clear those basic codes or is VAG COM essential?

I realise clearing codes isn't a magic solution, but if they are charging for "come back if you see the light again" ...

Bpmull

Special Circumstances wrote: »

Would one of those bluetooth obd scanners read and clear those basic codes or is VAG COM essential?

He had a snap on computer portable machine not sure how much the basic ones would do.

biko

C0N0R wrote: »

Sorry for jumping on your thread but is this a nct fail??

Yes, but please start your own thread if you have more questions.

Bpmull

Lights back on if it is this air flow meter how much are we talking ?

Foxhole Norman

Bpmull wrote: »

Lights back on if it is this air flow meter how much are we talking ?

For a genuine or close to genuine I'd say between €150-300 based on one for mine.

Bpmull

Bear with me as this theory may seem mad and it's not based on mechanics but logic. Here a list of the events.

Never seen light before have the car almost a year

Yesterday pull fuse 1 10amp fuse headlight level motors move the car a few times yesterday night.

This afternoon first time starting car light comes on and stays on a few times. Put back in fuse after a few starts by the time I get the mechanic lights gone out.

Back from the mechanic pull the fuse again as I was sure it wasn't related after a few starts drive light is back on.

Put back in fuse after 3 starts light is off and and drive 20km light still isn't coming on. Have started it 3 times since and light is staying off.

So being logical the fuse is causing the light to come on. Hopefully if I leave the fuse in the light won't come back on. Now how pulling a headlight motor fuse causes an eml and emissions warning I don't know. But somehow that's what's happening.

Special Circumstances

Are you sure it's not a french car?


Are you 100% you pulled the right fuse. Herself's mini has one mostly inactive headlamp motor. Which wouldn't be a problem in any jap car I've had,set and forget, but zee Germans like to go through a sweep of the lights every time they turn on apparently. But anyway, I'm not sure there is a dedicated fuse in the mini. Maybe it was the wrong fuse you pulled?

Bpmull

Special Circumstances wrote: »

Are you sure it's not a french car?


Are you 100% you pulled the right fuse. Herself's mini has one mostly inactive headlamp motor. Which wouldn't be a problem in any jap car I've had,set and forget, but zee Germans like to go through a sweep of the lights every time they turn on apparently. But anyway, I'm not sure there is a dedicated fuse in the mini. Maybe it was the wrong fuse you pulled?

It's the right fuse as the noisy shorting motor stops when you pull the fuse. But somehow it's causing it.

Special Circumstances

Headlamp motor fuse - in the cabin, or under zee bonnet? Just wondering.

Some kinda chafed wiring somewhere? Doesn't make sense that those circuits would be connected by design.

Bpmull

Special Circumstances wrote: »

Headlamp motor fuse - in the cabin, or under zee bonnet? Just wondering.

Some kinda chafed wiring somewhere? Doesn't make sense that those circuits would be connected by design.

It's in the cabin. It just says in the book that that fuse controls the headlamp motor but maybe there is something else it powers that is causing the light I don't know. It's probably the best thing that could happen if it is the case as it means there is nothing wrong that once I leave the fuse in it will be ok.

Mech1

Special Circumstances wrote: »

Headlamp motor fuse - in the cabin, or under zee bonnet? Just wondering.

Some kinda chafed wiring somewhere? Doesn't make sense that those circuits would be connected by design.

How about, A blown brake light bulb in a landrover / RangeRover, causes engine system fault, Transmission fault limited gears, HDC inactive, handbrake fault, suspension lowering etc.

http://www.rangerovers.net/forum/9-range-rover-sport-l320/49125-rrs-getting-messages-transmission-fault-hdc-system-fault-suspension-lowering.html

George Dalton

Would you believe that about a year ago we had a 2006 Mk5 1.9TDI in with an MIL on and a MAF code.

I replaced the missing fuse at the drivers A-pillar and that fixed the problem.

What fuse number did you remove?

Bpmull

George Dalton wrote: »

Would you believe that about a year ago we had a 2006 Mk5 1.9TDI in with an MIL on and a MAF code.

I replaced the missing fuse at the drivers A-pillar and that fixed the problem.

What fuse number did you remove?

Fuse number one top right corner first fuse 10amp the fuse compartment that's on the right when you open the drivers door kind of in the side of the dash same as where you replace that fuse.

Under description in the manual it just says headlight leveling motor and it did seem to stop the motor running when removed.

Special Circumstances

Mech1 wrote: »

How about, A blown brake light bulb in a landrover / RangeRover, causes engine system fault, Transmission fault limited gears, HDC inactive, handbrake fault, suspension lowering etc.

http://www.rangerovers.net/forum/9-range-rover-sport-l320/49125-rrs-getting-messages-transmission-fault-hdc-system-fault-suspension-lowering.html

Meh not hugely surprising. ;-) sarcasm. Kinda...

George Dalton

Bpmull wrote: »

Fuse number one top right corner first fuse 10amp the fuse compartment that's on the right when you open the drivers door kind of in the side of the dash same as where you replace that fuse.

Under description in the manual it just says headlight leveling motor and it did seem to stop the motor running when removed.

Fuse 1 supplies the MAF with a live feed. Mystery solved :pac:

Mech1

George Dalton wrote: »

Fuse 1 supplies the MAF with a live feed. Mystery solved :pac:

Nice one, well done for checkin that out.

Bpmull

George Dalton wrote: »

Fuse 1 supplies the MAF with a live feed. Mystery solved :pac:

Pity it doesn't say that in the manual. Thanks a million for your help.

George Dalton

Mech1 wrote: »

Nice one, well done for checkin that out.

These issues are always easy to diagnose the second time you see them! I lost a lot of time on that other car last year so it stuck in my mind!

Special Circumstances

Bpmull wrote: »

Pity it doesn't say that in the manual. Thanks a million for your help.

That's pretty bonkers that it has a such a secret hidden feature. Sh1t engineering or cunning accountancy?


I have the official workshop documents for my car (legitimately ) from a Russian subaru website. Be interesting to see the equivalent VAG docs and diagrams for yours.

Bpmull

Special Circumstances wrote: »

That's pretty bonkers that it has a such a secret hidden feature. Sh1t engineering or cunning accountancy?


I have the official workshop documents for my car (legitimately ) from a Russian subaru website. Be interesting to see the equivalent VAG docs and diagrams for yours.

I kind of assumed that any important engine electrical systems would be feed of the fuseboards in the engine bay and that the cabin board just feed cabin electrics and lights that kind of stuff. I thought if the fuse would be feeding anything addition it would be parking lights or something like that not a maf sensor.

The scary thing is if you were just going to go by the code that was logged you'd be down the price of a new maf sensor and still have a light.

Bpmull

So wonder how I effectively had the maf sensor turned off and the engine ran fine. I thought it was a fairly key component as it is ultimately Is working out the mass quantity of air the engine is getting and then how much fuel it has to add to have the correct combustion ratio is decided. Does it just default to run rich when the maf signal is not detected as a kind of worse case scenario approach of the conditions.

Foxhole Norman

Bpmull wrote: »

So wonder how I effectively had the maf sensor turned off and the engine ran fine. I thought it was a fairly key component as it is ultimately Is working out the mass quantity of air the engine is getting and then how much fuel it has to add to have the correct combustion ratio is decided. Does it just default to run rich when the maf signal is not detected as a kind of worse case scenario approach of the conditions.

MAF's can safely by disconnected and te car ran for a while, it makes the car run rich as far as I know as other wise it would cause it to chug or stall.

jca

Bpmull wrote: »

So wonder how I effectively had the maf sensor turned off and the engine ran fine. I thought it was a fairly key component as it is ultimately Is working out the mass quantity of air the engine is getting and then how much fuel it has to add to have the correct combustion ratio is decided. Does it just default to run rich when the maf signal is not detected as a kind of worse case scenario approach of the conditions.

The ECU logs a fault and then enters adaptive values from its map the adaptive values can be quite accurate making the car feel normal.