Category Archives: Emissions

DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1)

Posted on September 21, 2009 by DeadlySin3

So your check engine light is illuminated, and your code reader is spitting this out at ya: DTC P0420 Catalyst System Efficiency Below Threshold (Bank1) What, exactly, does this code mean? Is your catalytic converter at the end of it’s … Continue reading →

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Evap Emissions: Diagnosis & Testing

Posted on November 9, 2008 by DeadlySin3

The EVAP system can malfunction and allow fuel vapors to escape into the atmosphere as well as cause driveability problems like rough idle and stalling. In order to begin diagnostics, I would start by checking the vehicle for any Diagnostic … Continue reading →

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Evap Emissions: Description

Posted on November 8, 2008 by DeadlySin3

The purpose of the evaporative emissions control system (EVAP) is to prevent hydrocarbon emissions from leaving the fuel system and entering the atmosphere. Before these types of systems, fuel vapors were emitted into the atmosphere from vented gas caps as … Continue reading →

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