Question

2002 Hyundai Elantra with engine code P1127, what is the best solution?

Answer 1

Hi there

This code means the long term fuel trim is showing a rich condition. This can be caused by a faulty O2 sensor or a poor running engine. Also a possible cause could be a dirty air filter or mechanical condition with the engine. Fuel pressure regulator will do this if it's not working as well.