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CEL, Running fine? Here are the codes...

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  #1  
Old 03-31-2012, 09:41 PM
mochsl99's Avatar
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Location: Denver, CO
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Default CEL, Running fine? Here are the codes...

2003 A4 1.8t Avant Quattro, 84,000 miles.

My CEL just came on. I recently completed 80K service (oil, timing belt/water pump, air filter(s), plugs).

Ran VAGCOM and here are the codes:

2 Faults Found:
17519 - Oxygen (Lambda) Sensor Regulation: Bank 1
P1111 - 002 - System too Lean - MIL ON
17544 - Fuel Trim: Bank 1 (Add)
P1136 - 001 - System too Lean
Readiness: 0000 0000
I'm just starting to troubleshoot this, but will I damage it by continuing to drive the car until I figure it out? Any input appreciated.

Thanks in advance.
 
  #2  
Old 03-31-2012, 10:51 PM
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Default Check valve problem?

Could this check valve cause the codes/CEL? It's pretty much eaten up by corrosion:

 
  #3  
Old 03-31-2012, 11:59 PM
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Default Found the leak... now, part #?

The leak is a fractured check valve at the rear of the valve cover, in pretty tight quarters:



Now I just need to figure out: Will any check valve do? Or do I need a specific part #? EuropaParts.com: In-Line Check Valve - 058905291K - OE Aftermarket
 
  #4  
Old 04-01-2012, 09:47 AM
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Get the factory part only!
 
  #5  
Old 04-03-2012, 07:46 PM
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How did this turn out? Were you able to get it fixed?
 
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