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o2 sensor
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  1. New Member Area
    I have a 2005 altima 2.5. Couple of weeks backs, its SES light went on. Checked with local mechanic and code comes P0420. So he advised me to replace O2 sensors. He replaced both the sensors (upper and lower one). After 6-7 miles, SES again pops up. This time the code is different. The code is...
  2. QR25DE (2.5L, 02-Present)
    Just bought an 03 w 260k miles. Runs really rough. No water in oil. Codes P0037, P0138 and P0300. No excessive exhaust smoke. Looking for where to start. Will faulty O2 sensor foul plugs? Can you hear faulty injectors on these w stethoscope? What are common issues to look for on high mileage...
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