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Running Lean
Problem solved!! It ended up being a bad O2 sensor, so after about 3 hours of digging :hammer: and replacing the engine runs fine now. I'm just curious why it didnt come up that to begin with and only said that it was running lean in both banks. The engine would only act up when I came to a...- tigerhawk
- Post #6
- Forum: Stock 1995 - 2001 Explorers
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Running Lean
Hello all, first time poster here. Here is the guts of my problem. I have a 99 mountaineer 4wd with 105k on it. The CEL came on and I took it in for a diag at a dealer. The error code they got was that it was running lean. They spent about 4 hours troubleshooting it and couldn't find...- tigerhawk
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- Replies: 6
- Forum: Stock 1995 - 2001 Explorers