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Reply to "ISO advice on 2015 Jeep Grand Cherokee Overland -- check engine light is constantly on"
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[quote=Anonymous][quote=Anonymous][quote=Anonymous]I’d bet $100 it’s the downstream O2 sensor. You can drive it forever with the light on for this issue. Makes absolutely zero difference. The upstream O2 sensor does all the work in terms of F/A mixture, the downstream sensor just measures whether the cat is within normal NO2 and HS2 specs. [/quote] That was my initial guess but why do you think dealer guys couldn't fix it then? - np[/quote] I guessing they just cleared the code and dumped a bottle of Seafoam in it, figuring it wouldn’t come on again got a while, while still billing you for an hour labor for 3 minutes work. [/quote]
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