Greetings all; My wife's best friend's 2000 Sonata just popped a CEL- P1154. I'm out of town until Tuesday so she ran it by Autozone and had it cleared. The parts guy stated that it's fuel related, could have occured because she ran it below empty. My research indicates otherwise, pointing to an O2 sensor. Anyway, she's going to run the vehicle awhile and update me until I get back to Arizona. What's your thoughts??? TIA, Steve