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Truck throws CEL

posted Jul 12, 2016, 7:41 AM by Quoc-Anh Vuong   [ updated Aug 1, 2016, 2:14 PM ]
The CEL has been on for a long time, and today following the codes were read
  • P0153 - This involves the oxygen sensor upstream the catalytic converter on Bank 2.
  • P0401 EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
  • P1151 This particular DTC article refers to a P1151 trouble code on Ford vehicles. This does not apply to other makes of vehicles. A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time
  • P0308 A P0308 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #8.

I think it's time to replace the O2 sensor, clean the throttle body, and give this truck a good tune-up.

After reading the instructions on how to replace the spark-plugs, and also the class action law suits which Ford agreed to pay, I feel a bit dreadful on this attempt.
Another article on how to replace the spark-plugs, and another!


  • P1151
  • P0300 - Random Misfire
  • P0171 - System Too Lean (Bank 1)
  • P0401