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  1. 2002 CRV - Open circuit to upstream O2 Sensor

    Problems & Issues
    Hi folks, been spending way too much time troubleshooting this issue with my primary o2 sensor - I finally discovered that the heater malfunction code is occurring because the IG1 (positive battery voltage) connection on the sensor plug is not connected (open) to the under dash fusebox No. 4...
  2. 2011 CRV upstream oxygen sensor reads in milliamps (mA)

    Gen 3: 2007-2011 CR-V
    Hello, I am dealing with a PO420 issue and trying to do the citric acid soaking but wanted to check the sensors before I started... I bought a pretty pricey ($185) OBD scanner (Zurich ZR13) at Harbor Freight. It does everything SRS. ABS, Live data, etc. Anyway, the upstream O2 sensor is...
  3. 2002 CR-V Upstream O2 sensor - contradicting reviews

    Problems & Issues
    Hello, So I've determined that I need to replace the upstream o2 sensor; There are many available, OEM and aftermarket - the price different is remarkable, but I've read mixed feelings about the cheaper aftermarket o2 sensors - some people say they work fine, others say that it's bad and that...
  4. 2008 upstream oxygen sensor. Help locating and replacing please?

    Maintenance and Service
    My 2008 CRV had engine light come on a few weeks ago. Codes say it is upstream oxygen sensor. I purchased spare part on internet... its on its way. Would like to be prepared with right instructions and tools. Anyone offer help please?
  5. Upstream O2 sensor stay high 0.65V

    Problems & Issues
    My 2002 CR-V EX got P0420. Honda dealer asked for $1.7K to replace the catalytic converter. I hooked up the OBD2 and saw the downstream sensor after the converter was switching crazy while the upstream sensor kept sending around 0.65v out during driving and dropping down to 0v occasionally. I...