Family member has these codes on a 2001 (?) A6 2.7T.

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12-01-2006, 05:28 AM

bubba j

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Family member has these codes on a 2001 (?) A6 2.7T.

1. 17965 P1557 035
Turbo/Super Charger Boost Sensor (A) Circuit
Value above upper control limit
sporadic

2. 17521 P1113 035
Bank1, sensor 1
Internal resistance too Large
sporadic

3. 16805 P0421 035
Warm Up Catalyst, Bank1
Efficiency Below Threshold

Anything that can be DIY?

Thanks.

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12-01-2006, 05:48 AM

Kris Hansen

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Clear them, see if they come back, or how quickly.

The O2 codes could mean it needs new sensors, though the warm up sensor (sensor 2 on each side) is a common code, Audi had a flash for the ECU on some cars to lower the threshold..

The one relating to the boost sensor, could be a cut vac line or a bad sensor. I'm not sure where the sensor is on a 2.7t, I can look at the Bentley later if no one else chimes in.

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12-01-2006, 08:31 AM

bubba j

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#2 and #3 are both O2 sensors? So I could swap them out fairly cheaply?

Assuming they come back.

I don't suppose you guys have a FAQ on this, do you?

Thanks again.

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12-01-2006, 08:44 AM

jfk92

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interesting....I just had O2 sensor #2, right bank replaced

by audi (CEL came on) and they charged me $460 to do so. I also had an 'overboost' code from the turbo while at audi...they cleared the codes.........100-150 miles later CEL came on on my trip from north jersey up to N.E. area. a local garage pulled codes for me, indicated the codes were for right CAT, vac. or something and MAF sensor.....he cleared them. They have not yet returned. he indicated it could be a vac leak from a number of places etc. would take more diagnostics to find real issue....I just drive with my fingers crossed anymore hoping not to put any more $$$ into this car daily....

sorry my feedback isn't more useful to you...but there are some similarities here.....I think....

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12-01-2006, 11:32 AM

RLG

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Is the car chipped, stock, cats, etc?

The 3rd code is a common one (especially on chipped cars with high flow cats)- you can run non-foulers (do a search, lots of results) and clear that CELand see what happens. Not sure about the second code. Maybe the O2s are indeed just going south...

as far as the boost sensor code is concerned, maybe the sensor is going bad? Click on my sig to the classifieds - I've got a spare Boost pressure sensor for sale. They are over 100 bucks new...

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12-02-2006, 03:11 AM

skidmark

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Boost sensor is right on top of throttle body boot, car should be pressure tested for 1st code, and

replace primary(1st) O2 sensor on passenger side, and see what happens with 3rd code from there.

I am suggesting pressure test for 1st code beside what has already been suggested.(vacuum leak, bad sensor etc.)