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Help diagnosing problem on 2000 S4 76k mi

   
Old 04-07-2006, 11:45 AM
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Default Help diagnosing problem on 2000 S4 76k mi
My CEL is on with the following codes:

17544-Long Term Fuel Trim Add.Fuel,Bank1 System too Lean
17546-Long Term Fuel Trim Add.Fuel,Bank2 System too Lean
17521-Bank1-Sensor1 Internal Resistance too High

Searching the archives it seems it could be caused by the following:

Water Temp Sensor
O2 Sensor
MAF

What course of action does Audiworld suggest considering the model and mileage (btw - all parts are the original factory installed)

Clean MAF? (seen DIY instructions on this somewhere)
Replace Water Temp Sensor?
Replace O2 sensor? (any DIY tips?)
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Old 04-07-2006, 11:47 AM
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1st things 1st. Check for vacuum leaks.
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Old 04-07-2006, 11:50 AM
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I have a diagnostic vacuum gauge. What should it read at idle? And what would indicate leak?
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Old 04-07-2006, 12:07 PM
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it should be a STEADY 20-21 Hg
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Old 04-07-2006, 12:09 PM
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Default do u have a vag ? log 003 on a wot run (2000-5000 rpm )
and post it (it should go up into 200-s)
it could be the Maf (do u have bosch ?)
also pressure test the system .
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Old 04-07-2006, 12:24 PM
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Default Just pop the hood and look at the normal cuplrits, listen for a hiss, etc.
Eliminate the easy things first. If no leaks are found definitely check the MAF as per Lemieux.
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Old 04-07-2006, 12:25 PM
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Default Put a new passenger front O2 sensor in and a new (refurbished MAF) - then call it a day....
You can get both pretty cheap and your codes should go away.

Never heard of a coolant temp sensor throwing those codes.
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Old 04-07-2006, 12:26 PM
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Default Yes, 2000 MY uses Bosch MAF
I don't think my version of VAG-COM supports logging. (I am running an old "dumb interface" version because it's such a PITA to upgrade).
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Old 04-07-2006, 12:29 PM
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<searches for OEM O2 sensor and MAF>
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Old 04-07-2006, 12:34 PM
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Default unplug the maf and go for a ride .. it should feel better .
get another MAF sensor and change it ..
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