Question about 1996 Volkswagen Jetta
P0422 - Catalyst below threshold.
Catalytic converter is clogged or out of medium.
Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.
* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed
Common Problems That Trigger the P0422 Code
* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter
* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem
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Posted on Sep 28, 2010
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