Diagnostic code p0420?

Answer

The diagnostic code P0420 is officially titled: Catalyst System Efficiency Below Threshold (Bank 1). This means there is trouble in the car's emissions system. While it could be the catalytic converter as the name implies, this trouble code which will cause the check engine light to come on may be from any number of causes. An oxygen sensor or downstream oxygen sensor may have failed, become damaged, or is otherwise faulty. The coolant sensor may have failed as well. The oxygen sensors on the catalytic converter may have similar readings, the oil could be contaminated, the fuel injector could be leaking or the fuel pressure may be too high. The catalytic converter, exhaust pipe, muffler, or exhaust manifold could be damaged as well as the spark timing could be retarded. Any of these occurrences could cause this trouble code to register in the ECM.
Q&A Related to "Diagnostic code p0420?"
Trouble code P0420 means:Catalyst system efficiency below threshold.
http://wiki.answers.com/Q/What_is_diagnostic_code_...
The technical description for the P0420 code is "Catalyst System Efficiency Below Threshold (Bank 1) The catalyst system is part of the exhaust system; specifically, it's the
http://www.ehow.com/facts_7959765_p0420-code-1996-...
P0420 is Catalyst System Efficiency Below Threshold (Bank #1) Trouble area: - gas leakage on exhaust system - oxygen sensor - three-way cat. converter http://manual.shulsmann.com/
http://www.fixya.com/cars/t6450450-code_p0420
Evaporative Emission Control System Malfunction This indicates that a part of
http://www.chacha.com/question/what-is-the-p0420-c...
Explore this Topic
A P0420 code is an on board diagnostic (OBD) trouble code that means the catalyst system efficiency on bank 1 has fallen below threshold. this could be caused ...
P0420 Code is an indicator that means a converter is not working as it should be. It means the converter is working below its normal expectance and should be checked ...
The technical description for the P0420 code is "Catalyst System Efficiency Below Threshold (Bank 1) The catalyst system is part of the exhaust system; specifically ...
About -  Privacy -  AskEraser  -  Careers -  Ask Blog -  Mobile -  Help -  Feedback © 2014 Ask.com