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S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

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Old 11-11-2009, 10:01 PM   #1
valentine1
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Default 17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High

Can someone please confirm which Oxygen Sensor this is supposed to be:

17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High

The check engine light that was triggered by this code has gone away not however...

Are there any other problems that could cause this code to be logged?

I have noticed my mileage is a little worse than it was half a year ago and apparently bad ox sensors can cause this, no???
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Old 11-12-2009, 03:12 AM   #2
Texas Twin T
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Passenger front, which is the easy one to replace.
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Old 11-13-2009, 01:20 AM   #3
valentine1
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Awesome thanks.
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Old 11-13-2009, 06:09 AM   #4
donromani
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Quote:
Originally Posted by valentine1 View Post
Can someone please confirm which Oxygen Sensor this is supposed to be:

17521 - Oxygen (Lambda) Sensor: B1 S1: Internal Resistance too High

The check engine light that was triggered by this code has gone away not however...

Are there any other problems that could cause this code to be logged?

I have noticed my mileage is a little worse than it was half a year ago and apparently bad ox sensors can cause this, no???
I'm not sure what it is in the o2 sensor that causes this code but it typically means that the sensor is failing. If it was totally Kaput you'd have a "short to ground" code. Yes, a bad O2 sensor can decrease your fuel efficiency.
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Old 11-13-2009, 06:09 AM
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17521, 2001, a4, a8, audi, b1, b1s1, high, internal, lambda, location, oxygen, resistance, s1, sensor




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