P0420 Diagnostic Trouble Code Discussion for April 2004
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2000 Volkswagen Jetta GLS 2.8L MIL Lamp on VIN: 3VWSE29M1Y P0420: catalyst system efficiency below threshold bank 1. ... trucks, and some american cars.this problem is with my daughters car. check engine lite was on so i pulled codes p1256 and p0420. i replaced ect sensor and found out volkswagon redesined it because of problems. reset co... |
April 07, 2004 |
