Question about Toyota Corolla
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Posted on Jan 02, 2017
SOURCE: P0421 CODES AND C1201
C1201 error code means that you have some problem in engine control system.
Possible causes for P0421 error
The P0421 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem.
Posted on Apr 24, 2014
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