Vacuum leak...please help

[OiNK]

Hi all, I am new here and have just had my S3 throw the EML light on with code p0171 running lean bank 1.

A lot of reading suggests a vacuum leak or bad maf sensor. Is there anyway to confirm a fault maf sensor? The car drives and idles fine, idle is possibly very minimally lumpy.

I saw this which looks like a crack to me can anyone confirm if this is normal or cracked? If cracked where could I order a genuine part online?

 

[francisbeaton]

Definitely cracked m8.
You should try TPS trade part specialists.
This crack and the incoming air and dirt will be interfering with the MAF readings.
I would have this replaced as a good first step.

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[OiNK]

Thanks, so this would add up to having that fault code then?

Any idea on a part number?

 

[francisbeaton]

It is definitely the right first step m8.
As you no doubt know yourself faults can be difficult to pin down exactly.
Replacing this broken filter housing/ air box is definitely the first thing to eliminate.
Have this done and go from there.
TPS website will get you to the right part no bother.... check their website m8.
Good luck.

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[mechanic69]

The s3 engine does feel a bit lumpy on idle, but looks like a crack. The map is further up the intake so would it notice the additional air if the crack was taking air?


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[mechanic69]

Replace with a CAI


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