madkaw Posted April 23, 2012 Share Posted April 23, 2012 My AFR guage has been a little erratic lately. It seems to do okay at cruise, but during WOT and other times the guage drops full lean occasionally. I did some searching and it seems that coolant can contaminate the sensor and I did recently have a head gasket go which in turn put coolant in the exhaust. Anyone confirm this before I lay out the money for another sensor? I will add the the guage worked great before this and I have checked all wires and pulled the O2 sensor out and recalibrated it according to the manual. I have also checked for loose grounds or wires. Quote Link to comment Share on other sites More sharing options...
Kris.Is.Awesome Posted April 23, 2012 Share Posted April 23, 2012 innovate or AEM? Quote Link to comment Share on other sites More sharing options...
bradyzq Posted April 23, 2012 Share Posted April 23, 2012 I can confirm that water or coolant can most definitely kill widebands. A head gasket let go on the dyno once and the AFR on the wideband instantly showed 30:1 or higher, and wouldn't come back down on any other car afterwards. You can try removing it and heating/cleaning it with a propane torch, but that has worked for me only for a short time, and not very often.... Quote Link to comment Share on other sites More sharing options...
madkaw Posted April 24, 2012 Author Share Posted April 24, 2012 Innovate Quote Link to comment Share on other sites More sharing options...
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