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  1. J

    O2 sensor code problems

    Well, it was burnt wires! But they weren't easy to find -- they were inside the heat sheathing above the EGR exhaust piping. As it turns out, that is the most likely location for this to happen. I wish someone could have told me without me spending many amateur hours looking for it. Anyhow...
  2. J

    O2 sensor code problems

    So far, in the past many hours and week, I have not found any damaged wiring or open grounds. No shorts. No water in connectors. New O2 sensors upstream. new, good battery. The car was kept well and is in great condition throughout. This is very strange to throw these codes now. I can't...
  3. J

    O2 sensor code problems

    Thank You TECHGURU for all the great data and explanations of what the codes mean. Appears that I definitely have something wrong in the upstream O2 heater circuits for both banks. It just seems odd to me that they would both go bad at the same time, unless there is a commonality between them...
  4. J

    O2 sensor code problems

    Hi, I'm new, and hope to get some advice from your experienced forum folks. My ladie's 2003 Ford Explorer Eddie Bauer 4.6L was throwing P0135, PP0053, and P0155, so I did the amateur thing and changed both upstream O2 sensors. I cleared the codes with my OBD2 scanner, and after a few cold/hot...
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