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P0422 Diagnostic Trouble Code Discussion for April 2013

Catalyst Efficiency Below Normal (Bank 1)

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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2002 Jeep Grand Cherokee Sport 4.0L MIL Lamp on VIN: 1J4GW38SX2
P0422: Evap leak. Sets codes P0455 & P0422 (evap leaks). I have checked all hoses and connections. Purge solenoid works. Can hear the leak detection pump (LDP) click when commanded with Modis. I don't see where I can close the LDP to seal the system, so I plugged the vent h...
April 26, 2013