P0421
Warm Up Catalyst Efficiency Below Threshold (Bank 1)
A code P0421 may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading (functioning) properly A sparkplug is fouled up
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter).
In fact, it would be a good idea to test each oxygen O2 sensor while you're at it. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem.
Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
Read more at: http://www.obd-codes.com/p0421
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