Combo of codes

By swaffj
October 22, 2016 in Gen III & Gen IV V8 Engines (LS-Based)

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swaffj

Posted October 22, 2016

Hi everyone,

My engine light is on, and I have several codes. I could replace the oxygen sensors, and also knock sensors, but instead of doing that, do you think something else could be causing a combination of the below codes?:

- P0135 - The Powertrain Computer or PCM has determined that the Oxygen Sensor has taken too long to begin switching after the Engine Coolant Temperature Sensor has reached its proper operating range, preventing closed loop fuel control. OBD IIP0135 Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

- P0137 - P0137 refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes.

- P0327 - Knock sensor on bank 1.

- P0332 - Knock sensor on bank 2.

Do you think my main problem is an exhaust leak, or a bad CPU board, or something else?

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