Join Date: Feb 2017
Location: St. Louis, Missouri
Moooboy, your C44 code applies to #2 02 sensor, which is the rear cylinder. Be aware that in diagnosis you have the ECM, wiring between the 02 and the the ECM, and the 02 itself as possible culprits.
This code applies to both sensor and the sensor heater operation.
An 02 is a "camera" for the ECM for adjustment to air-fuel ratio via injection duration. ANYTHING that causes the camera to give a signal that the ECM doesnt recognize can set an 02 code. A vacuum leak or dirty injector are just 2 examples.
An item that would affect both cylinders, such as low fuel pump pressure wont apply as you have only a code for 1 cylinder.
More than likely it's just a bad 02 sensor, but the proof will be in its replacement unless you want to go through all the diagnostic steps for that code.
"Get a code, get a part" doesnt always work.
Last edited by MAZ4ME; 06-22-2019 at 01:58 PM.