Mazda exhaust code error 2011 es engine service light drivefast1971 system 2002 exploded 2001 cat does 1999 2003 est edited I have a 06 mitsubishi endeavor that has an error code p0421. the P0421 — warm up catalyst efficiency below threshold (bank 1) – eeuroparts
P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold
Solving the p0421 code: catalyst efficiency below threshold
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P0421 code: warm up catalyst efficiency below threshold (bank 1)
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Decoding the p0421 code: troubleshooting mitsubishi outlander's
Code p0421 catalytic converter: my car had 2 p0421 codes, page 3Error code p0421? P0421 – warm up catalytic converter bank 1 efficiency below threshold.
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