Glow plug yellow warning light flashing

Glow plug yellow warning light flashing

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Discussion

bebetositu

Original Poster:

32 posts

144 months

Friday 9th November 2018
quotequote all
Hi, I have a 12 reg Audi A1 1.6 Diesel, mileage 85,000, the glow plug yellow warning light flashing, photo attached, I do 60 miles a day mainly on motorway.

I took it to the local garage for a scan and the guy in the garage replace the mass air flow sensor and differential pressure sensor for me and ran the scan again, the data reading fine. But after I drove for 30 miles, the glow plug light come back again, any idea what would be the problem?

Thanks



Edited by bebetositu on Friday 9th November 10:37

M_A_S

1,441 posts

184 months

Friday 9th November 2018
quotequote all
What were the fault codes?

Uppy89

71 posts

101 months

Friday 9th November 2018
quotequote all
I remember reading a few similar threads when I used to frequent some Audi forums when I had my A3. From what I remember, there are a few reasons this could happen but the most common was a brake light bulb had gone or the brake light switch was faulty. Might be worth a check as it would be a cheap fix rather than taking it back to a garage.

bebetositu

Original Poster:

32 posts

144 months

Friday 9th November 2018
quotequote all
M_A_S said:
What were the fault codes?
The fault codes saying mass air flow sensor and differential pressure sensor failed, new sensors fitted.

CJ1

468 posts

77 months

Friday 9th November 2018
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I had a Polo 1.6TDI with the same engine. The flashing coil is basically the check engine light. The first time it came on for me was an EGR Valve (very very common on these engines) and the second time was an injector.

Although the car was 8 years old, because I had the emissions scandal recall done they give every car a 2 year “warranty”, so my 2010 Polo had both parts replaced free of charge. Maybe worth getting it booked into Audi for Free and see what they say.

Here’s a link:
https://www.honestjohn.co.uk/news/legal-motoring-a...

Nickyboy

6,700 posts

233 months

Friday 9th November 2018
quotequote all
That light in my Vectra flashes when the DPF is clogged and needs re-genning

cptsideways

13,535 posts

251 months

Friday 9th November 2018
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Its a very standard VAG fault, check your brake lights work all the time. Its a faulty brake light switch. Yes really.

Guaranteed 100%

gti_dreamer

176 posts

114 months

Friday 9th November 2018
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Uppy89 said:
I remember reading a few similar threads when I used to frequent some Audi forums when I had my A3. From what I remember, there are a few reasons this could happen but the most common was a brake light bulb had gone or the brake light switch was faulty. Might be worth a check as it would be a cheap fix rather than taking it back to a garage.
I bet it's this.

pherlopolus

2,087 posts

157 months

Friday 9th November 2018
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Our V reg Sharan did this, I thought they would have sorted it by now!

PurpleTurtle

6,935 posts

143 months

Friday 9th November 2018
quotequote all
bebetositu said:
M_A_S said:
What were the fault codes?
The fault codes saying mass air flow sensor and differential pressure sensor failed, new sensors fitted.
So you’ve got two sensor related fault codes, you’ve taken it to the garage who have charged you for replacing the two said sensors then 30 miles later you are getting (presumably) the same two sensor related fault codes.

Why on earth aren’t you stood at their service desk saying “you’ve charged me to fix this, it’s not fixed, please fix it for no additional cost as per your original diagnosis”

SMH, as the yoof say.

MDJ

133 posts

171 months

Saturday 10th November 2018
quotequote all
cptsideways said:
Its a very standard VAG fault, check your brake lights work all the time. Its a faulty brake light switch. Yes really.

Guaranteed 100%
I’d agree with this. Had exactly the same with my 140k mile 2004 A4 recently. Zero brake lights (not ideal!) and lost cruise control function too. Only happened the once, about a month ago so I’m keeping an eye on it.

bebetositu

Original Poster:

32 posts

144 months

Tuesday 11th December 2018
quotequote all
cptsideways said:
Its a very standard VAG fault, check your brake lights work all the time. Its a faulty brake light switch. Yes really.

Guaranteed 100%
How do you check the brake light switch faulty or not?

bebetositu

Original Poster:

32 posts

144 months

Wednesday 12th December 2018
quotequote all
gti_dreamer said:
Uppy89 said:
I remember reading a few similar threads when I used to frequent some Audi forums when I had my A3. From what I remember, there are a few reasons this could happen but the most common was a brake light bulb had gone or the brake light switch was faulty. Might be worth a check as it would be a cheap fix rather than taking it back to a garage.
I bet it's this.
I have checked the brake lights, all working fine, perhaps to use a multimeter to check the brake light switch next?

bebetositu

Original Poster:

32 posts

144 months

Wednesday 12th December 2018
quotequote all
Nickyboy said:
That light in my Vectra flashes when the DPF is clogged and needs re-genning
I doubt it is related to the clogged DPF, the DPF yellow light will stay on rather than the glow plug light, normally drive in motorway or A-road in 4th gear at 60mph for 10-20 mins will solve the clogged DPF problem. I am driving the car mainly on motorway and A-road daily, so I don't think the DPF is clogged.

Oscar011

169 posts

72 months

Wednesday 12th December 2018
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Have you checked all the fuses in the engine bay fuse box?

bebetositu

Original Poster:

32 posts

144 months

Wednesday 12th December 2018
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Oscar011 said:
Have you checked all the fuses in the engine bay fuse box?
Yes, I also have the Auto Electrician checked all the wires connect to the Mass air flow sensor too, no wiring issues, code scan always showing mass air flow fault.

bebetositu

Original Poster:

32 posts

144 months

Wednesday 12th December 2018
quotequote all
Has anyone heard of TPS, I believe it is the VW Groups genuine parts supplier, the mass air flow sensor was bought from them from the garage, see photo attached, I also phoned TPS myself to double check with the part number 03L 906 461, they confirmed it is one of there part. The garage thought there my be fault on the first sensor, so they ordered a second one from TPS again, and it is exactly the same senor, so perhaps I can say there is no problem with the mass air flow sensor itself as it is a genuine part and it has been replaced twice, although the code reading still showing mass air flow fault code.



Oscar011

169 posts

72 months

Wednesday 12th December 2018
quotequote all
bebetositu said:
Oscar011 said:
Have you checked all the fuses in the engine bay fuse box?
Yes, I also have the Auto Electrician checked all the wires connect to the Mass air flow sensor too, no wiring issues, code scan always showing mass air flow fault.
Is it possible your mechanic has put in the wrong differential sensor in? A few years ago my mate ordered a MAP sensor as his EML light was on. The part arrived and fitted and was exactly the same as the one came off. Yet he couldn’t get the light to go out. In the end he took it back out and realised his old part number had something like a, B on the end of the part number and his original had a, A on the end of the number. Long story short part number B worked and the light went out. Maybe this could be similar in your case? Or maybe your differential sensor just needs adapting on VCDS?
Hope you get it sorted soon biggrin

DuraAce

4,240 posts

159 months

Wednesday 12th December 2018
quotequote all
bebetositu said:
Yes, I also have the Auto Electrician checked all the wires connect to the Mass air flow sensor too, no wiring issues, code scan always showing mass air flow fault.
Code reading isn't enough. It only points you in the right direction.

The MAF signals+wiring (amongst others) need analysing with an oscilloscope to determine where within the system the fault originates...eg sensor, wiring, control unit etc

Blindly throwing parts at a car is not the sign of a competent mechanic!

bebetositu

Original Poster:

32 posts

144 months

Wednesday 12th December 2018
quotequote all
This is code, anyone has the same code before?