2005 Jeep Wrangler Sport-Code P0420—–

Maryland VEIP failure; customer brought this vehicle into the shop with check engine light on and VEIP failure slip.  In one hand the failure slip and the other a “universal” catalytic converter.

Code presented was a P0420.  Catalyst efficiency below threshold.  This doesn’t always mean the catalytic converter is bad, but chances are very likely for this.  We ran some O2 performance tests and checked the ability for the cats to retain O2 by introducing a vacuum leak and checking the gas levels with our 5 gas analyzer. 

Testing concludes that the cats have failed or another internal issue.  Advised customer of repair needs.

Removed existing cats to find that one of the catalytic converters (pre-cat), was empty….

Replaced all three converters, retest with 5 gas, PASS!

ANOTHER VEIP FAILURE TURNED INTO A SUCCESS WITH A PASS!