Quote:
Originally posted by 21tgs
An update regarding the O2 sensor and the check engine light (MIL).
What I found while searching www.dejanews.com is that the Canadian government has performed tests on various fuels to find that Exxon fuel has a relatively high sulfur (S) content. I couldn’t believe that Exxon fuel was my problem, but at the same time I don’t buy Exxon in my home town, I buy Sunoco. While on the trip that caused the MIL to illuminate I bought fuel from 3 different Exxon stations.
I am now running a fresh tank of Sunoco fuel. I used my OBD-II scanner to erase the code from the computer and the MIL has remained off for nearly 100 miles and several drive cycles. I guess that may be it was the Exxon fuel.
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Wow, that is very interesting. Im gonna have to look into this. I am a automotive tech and have never heard of this. Hmm.
There are ways to test non-heated O2 sensors. One is with a real good DVOM(Digital Volt Ohm Meter) and with a data display capible scan tool. I prefer the DVOM method. I have found that unless you have a mfg. specific scan tool(Consult for Nissans) the refresh rate tends to be too slow to accuratly "watch" O2 sensors. For instance, I work at a GMC dealer so we have the GM Tech II, for all the other stuff that comes in we have a Snap-On Mt2500(?). I find the refresh rate of the Tech II pretty damn good, the MT on the other hand is horrible. This is why for non-GM stuff I preffer to use my Fluke 88 DVOM(god, I love that thing).
If your problem comes back drop me a line and Ill try to help you diag that thing. If it doesnt, thats great!