Audi a3 saloon 2015 intermittent starting issue

[Ridwan]

Hi all,

I have an a3 saloon 2015,2.0 TDI S Line. Recently I have been having intermittent starting issues. It does eventually turn over, sometimes instantly, sometimes after about 7 seconds. I had the battery and alternator checked and they were OK.

Once started it doesn't give me any issues unless I leave it for 1.5 to 2 days. My local mechanic just said to leave it till it gets worse but I'm not happy with that. Please can any give me some advice?

 

[leonwilliams]

Hi cant for life in me rember what ita called but its a sensor that could be the issue

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[AlS3BE]

Crank position sensor?

Hi cant for life in me rember what ita called but its a sensor that could be the issue

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[Ridwan]

Thanks for your replies, BTW forgot to mention, no engine management light. Can it still be a sensor?

 

[AlS3BE]

Thanks for your replies, BTW forgot to mention, no engine management light. Can it still be a sensor?

A sensor can still send a signal within normal operating range, like a thermometer showing between 0-100, but the signal it sends could be fibs/bs. In that scenario sensor is faulty but won’t flag an error as the signal is still within 0-100. Error only occurs when it shows something outside the range like -100 or 1000 in the thermometer example.

 

[Ridwan]

A sensor can still send a signal within normal operating range, like a thermometer showing between 0-100, but the signal it sends could be fibs/bs. In that scenario sensor is faulty but won’t flag an error as the signal is still within 0-100. Error only occurs when it shows something outside the range like -100 or 1000 in the thermometer example.

Is it expensive to repair?

 

[AlS3BE]

Is it expensive to repair?

Not sure.
only guessing it’s a sensor problem. Could be a number of things. Fuel, fuel filter, injectors, sensor, the lists goes on. Needs a proper diagnostic at someone who knows what they are doing or like your mechanic says wait till something breaks.

 

[Ridwan]

Thank you, think I will leave it and see what happens!

 

[leonwilliams]

I had similiar issue intermitten was crankshaft sensor not expensive to but difficult to fit on my A4 when car was warm it was fine

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[Ridwan]

I had similiar issue intermitten was crankshaft sensor not expensive to but difficult to fit on my A4 when car was warm it was fine

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Hmm, well it gives me peace of mind knowing it could be down to a sensor only. At the moment I can put up with it, so will look to repair this in the near future!

 

[Ridwan]

I'm glad that it's possibly nothing major, also iv googled it and I am having the engine vibrations when idle also, so I'm pretty confident it may just be the crank shaft sensor!

 

[Ridwan]

I had similiar issue intermitten was crankshaft sensor not expensive to but difficult to fit on my A4 when car was warm it was fine

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Forgot to ask, did it thrown a code?

 

[leonwilliams]

Yea it did can't remember what it some po thing

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[Audi-Sport-Driver]

Hi cant for life in me rember what ita called but its a sensor that could be the issue

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Camshaft position sensor

 

[Audi-Sport-Driver]

Hi all,

I have an a3 saloon 2015,2.0 TDI S Line. Recently I have been having intermittent starting issues. It does eventually turn over, sometimes instantly, sometimes after about 7 seconds. I had the battery and alternator checked and they were OK.

Once started it doesn't give me any issues unless I leave it for 1.5 to 2 days. My local mechanic just said to leave it till it gets worse but I'm not happy with that. Please can any give me some advice?

I have same car and sometimes starts longer sometimes shorter but never had like 7 seconds ... Max 3 to 4 seconds. It all depends of weather conditions too temp changes etc.. Cars sat mostly outside ... I can giv you advice
1. change all glow plugs 2. Change oil to castrol 3. Clean camshaft position sensor 4. replace v-ribbed belt
Did they check starter ?
I had previously camshaft position sensor fault and I checked on YT and removed sensor cleaned it and cleaned hole inside put back in since never had fault for sensor anymore in VCDS : )

 

[Ridwan]

I have same car and sometimes starts longer sometimes shorter but never had like 7 seconds ... Max 3 to 4 seconds. It all depends of weather conditions too temp changes etc.. Cars sat mostly outside ... I can giv you advice
1. change all glow plugs 2. Change oil to castrol 3. Clean camshaft position sensor 4. replace v-ribbed belt
Did they check starter ?
I had previously camshaft position sensor fault and I checked on YT and removed sensor cleaned it and cleaned hole inside put back in since never had fault for sensor anymore in VCDS : )

Hi, I finally got to replacing the sensor, crank position, no luck! Did you have same issue as me? Thanks

 

[Ridwan]

I have same car and sometimes starts longer sometimes shorter but never had like 7 seconds ... Max 3 to 4 seconds. It all depends of weather conditions too temp changes etc.. Cars sat mostly outside ... I can giv you advice
1. change all glow plugs 2. Change oil to castrol 3. Clean camshaft position sensor 4. replace v-ribbed belt
Did they check starter ?
I had previously camshaft position sensor fault and I checked on YT and removed sensor cleaned it and cleaned hole inside put back in since never had fault for sensor anymore in VCDS : )

Haven't checked starter, but replaced sensor, did battery alternator check, no codes apart from glow plug? I'm stumped,