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Engine management light and OBD code meaning

Tiny
RUSSBOLT
  • MEMBER
  • 2004 AUDI TT
  • 1.8L
  • 4 CYL
  • TURBO
  • 4WD
  • MANUAL
  • 80,000 MILES
My engine management light has come on (I have owned the car for 4 days). I have contacted the garage I bought it from and they have said its probably nothing and is down to the way I have driven it, I do not think this is the case. Anyway I have put on a OBD diagnostic scanner and it has come up with the code 'P0171' and says something about bank 1 running to lean. What does this actually mean? I just don't want to take it to the garage on Saturday and be ignorant to the problem, I just want to go in with all info I can.

Thanks

Russ B
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Thursday, December 4th, 2014 AT 12:05 AM

3 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
That means the the side with cylinder #1 has detected too much air in the exhaust after combustion. Most likely you have a leak somewhere in the intake manifold or a hose going to to it.
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Thursday, December 4th, 2014 AT 4:33 AM
Tiny
RUSSBOLT
  • MEMBER
  • 2 POSTS
Great, thanks very much. That seems to make sense to a lay person like myself. Would this effect MPG too?
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Thursday, December 4th, 2014 AT 4:50 AM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Yes, it will have some affect on your fuel economy.
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Thursday, December 4th, 2014 AT 5:09 AM

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