[John Rogers]

Years ago when I installed O2 sensors in my 914-6 race car I found a website that covered all O2 sensors and what their response to signal changes where and also what their connectors were like. Don't have it any longer I am afraid. In that case I used Bosch sensors and they worked great.

With my 2.4L Chevy HHR the O2 sensor behind the cat started throwing codes and my code reader said a failing cat was the cause. The sate of CA says the cat has to be CARB approved either dealer supplied or a few after market and the dealer has to put it on! Cost is approx. $1300 or so and I asked my friend at a repair shop and he said the cat assembly I.E. cat, sensors, pipe and fittings are all made up in L.A. pretty much by the same place. Just stick different labels on them, sooooooo I tried to by one ($250) from Rock Auto but they said no. I had my daughter in Phoenix get it for me then mail it over and it had no label? Works just like the stock one, sensors and all!