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Discussion Starter · #1 ·
My check engine light had turned on and I got these three error codes: PO455, PO442, PO304.

Does anyone know if these three error codes reflect something in common?

Symptoms:When I remove Gas cap there is no pressure sound(no hissing) and while pumping gas the gas pump will shut off every few seconds of pumping.

The car idles rough, fluctuating from about 800-1100 RPM on idle, and runs a bit sluggish when accelerating.

What I've done recently in the past few weeks: Replaced Throttle Position Sensor, Replaced Purge Control Valve, cleaned out and inspected Charcoal box.

Please let me know what you'd troubleshoot first given these three OBD codes. Thank you!
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