Tag Archive for 'evap cannister purge valve'

Jeep 2002, 4.0 L, 120K has a Trouble code PO456 and Pending code PO442

Peter’s question: Hi,  Jeep 2002, 4.0 L, 120K has a Trouble code PO456 and Pending code PO442 – Evaporative Emission System. The MIL is ON. What do you recommend me to do? Thank you, Peter ” Answer: Those are both codes for small evap system leaks–The hardest ones to find. They can be REALLY small. […]



css.php