Richard1296 Posted November 7, 2006 Share Posted November 7, 2006 My 2000 Impreza Outback Sport is giving me a P1133 code. Anyone with experience on this. I guess its the O2 sensor but which one (I guess I have 2). Don't suppose anyone has a good one to part with ? Richard Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted November 8, 2006 Share Posted November 8, 2006 Well that code, at least of an '00OBW, is front oxygen (a/f) sensor heater circuit high input. Unfortunately, in the troubleshooting procedure for this issue, it never says replace the o2 sensor; the only item it lists for replacement is the ECM. Other things include repairing battery short circuit in harness between ECM and front o2 sensor; read front o2 sensor heater current and make sure value is less than 2.3A (otherwise replace ECM), shake the harnesses. Quote Link to comment Share on other sites More sharing options...
ferret Posted November 8, 2006 Share Posted November 8, 2006 Porcupine is correct, but 'melted' shorted heater wires could cause this also. Check the wires by the front oxygen sensor and be certain they were not on the exhaust and melted there. P1133 is a direct short sensed by the ECU which is why the suspects are the ECU and the wiring harness. I have never seen this code, but I would imagine a shorted heater element in the front oxygen sensor could cause this also. Quote Link to comment Share on other sites More sharing options...
Richard1296 Posted November 8, 2006 Author Share Posted November 8, 2006 I bet an ECM would be an expensive item...hope I don't need one. May be a few days till I get to look under it, thanks. Richard Quote Link to comment Share on other sites More sharing options...
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