DTC P0146: Rear Ho2S, No Activity Detected: Condition

DTC is set when rear oxygen sensor signal voltage does not exceed .55 volt for 30 seconds after engine has reached normal operating temperature and engine speed is more than 1500 RPM. Voltage is monitored by PCM during Drive Mode 3. Possible causes are:

• Oxygen sensor.
• Open or short circuit.
• Low compression.
• Engine malfunction.