OXYGEN SENSOR/ANTIKNOCK SENSOR

2001 GMC C2500

Tiny

ronstephens1

December, 14, 2010 AT 11:22 PM

2001 GMC 2500 has "service engine" in message center
local oil change shop says error messages indicate problem with O2 sensor and anti-knock sensor. They recommend replacing all 4 O2 sensors but told me to take truck to someone who works on engines to fix antiknock sensor. Their part will cost $569. And said other sensor replacement may be double that. I will do it if necessary. What do you recommend?

FOUND 3465 RELATED QUESTIONS

1 Answer

Tiny

Jacobandnickolas

December, 20, 2010 AT 10:47 PM

First, the O2 codes should indicate which sensor is bad. You shouldn't have to replace all of them. The chances of all of them going bad is very odd. Next, I believe they are refering to the knock sensor. That, itself, could cause the O2 sensors to show bad readings because the knock sensor plays with ignition timing.

I agree with him. Have it checked by a different shop. I don't feel you need all the work they are requesting.

Joe

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