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How many post cat O2 sensor on 2002 Avalanche 2500 with 8.1L motor?

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How many post cat O2 sensor on 2002 Avalanche 2500 with 8.1L motor?

  #1  
Old 10-26-2011, 01:27 PM
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Join Date: Oct 2011
Posts: 3
Default How many post cat O2 sensor on 2002 Avalanche 2500 with 8.1L motor?

Hi all.
I have moved from Canada to California. I own a 2002 Chevrolet Avalanche 2500 model with the 8.1L motor.
While trying to get the vehicle certified for use in California I took it to a DMV referee whose documentation shows that it should have two O2 sensors after the catalytic converters, one on each pipe 4-6 inches after the cat. These post cat O2 sensors are not on the vehicle. I contacted GM and they faxed me a diagram showing where the post cat O2 sensors should be and they are not there. What is there is a cap of some kind which could be unscrewed so that an O2 sensor could be put in.
I bought the vehicle new. The emissions equipment have never been touched. The cats/muffler/exhaust have never been touched and are all completely stock. The vehicle passes smog testing both in California and in Canada.
I would like to know if forum readers who purchased the 2002 Avalanche in California with the 2500 option and 8.1L motor have these two post cat O2 sensors installed or not.
GM documentation says there should be four sensors total, two pre cat and two post cat but my vehicle only has the two pre-cat O2 sensors and the post cats are absent.
Is anyone out there willing to crawl underneath their 2002 Avalanche 2500 with 8.1L motor and tell me if they have post cat O2 sensors?
If you are, thanks in advance!

Blake
 
  #2  
Old 02-15-2012, 01:45 PM
Join Date: Feb 2012
Posts: 6
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Destry Foyte says he looked at his 2002 and his are there but it came from Minnesota. Probably the difference is that Canada didn't require it so Gm didn't put them on would be my thinking.
 
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