Quote:
Originally Posted by JFP in PA
P1123 is the code thrown when oxygen sensor on bank 1 reaches its limit trying to lean out an overly rich mixture. Normal suspects are high fuel pressure (bad regulator) or a leaking injector.
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Is there a way I can test to figure out the true problem (oxygen sensors / leaking injector / fuel pressure regulator)? I would like to avoid taking the car to a shop just to find out it was something I could have fixed.
When the problem is fixed, will the CEL go out or does it have to be cleared?
The car is running perfectly. Wouldn't a leaking injector cause the engine to run rough?
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