OBD code / check engine light - '02 S/T

[Brad Carroll]

Check engine light came on last weekend -- couldnt stand it and went to Auto Zone for a check. Showed code errors 135 and 1120. I just rolled 70,000 miles and it runs great -- although mileage has dropped the last couple of weeks...Had the DPTE (?) sensor replaced last year (35,000 miles) under warranty. Could it be that again?

Brad

 

[Kevin Palmer]

P0135 Heated O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

P1120 TP Sensor Out Of Range Low (Ratch Too Low)



These are a true failure code. Unlike many codes that will read out of range for example.

Check the wiring going to these components as well as all your fuses. There are various fuses that either drive part of the ECM/PCM or that run the component thru various modules.