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02 sensor

  1. S

    Oxygen sensor resistance question

    Sorry if this is in the wrong section. Does anyone know what reading the rear oxygen sensor should have? This is the one at the rear of the cat. Basically, I’m getting a mil light based on the oxygen sensor. I’m wondering if I can possibly insert a resistor across the pins to fool the system...
  2. HardacreA

    EML Pre-Cat won't go away

    Took my car for it's MOT couple of weeks ago which failed on emissions and the CO/Lambda was out, assumed this was the pre-cat lambda. I got that replaced with one I had (Bosch) and the print out from the garage that replaced it looked normal again (0.04 out on CO cause of aftermarket CAT). Went...
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