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  1. Forward O2 sensor and ECM computer?

    smart Operation and Maintenance
    I recently had to have my engine rebuilt due to overheating. After I got it back, the engine light came on with an O2 sensor warning. The mechanic replaced the O2 sensor with a brand new one, but said they were still not getting any signal from it. They claim they went through the wiring...
  2. Downstream O2 sensor

    smart Operation and Maintenance
    So my check engine light came on in my 2008 Passion. Turns out both O2 sensors were bad. The dealer quoted a fortune, so after a little reading I ordered 2 OEM replacements and took them to my local mechanic. One fit perfectly, but apparently the downstream sensor is a 6 wire model, so he...
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