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OBDExplorerResult

Vehicle Manufacturer: Ford Motor Company
Established: 6/16/1903
Country of Origin: USA



Manufacturer Tech Info website:
http://www.motorcraft.com/


EU Specific Manufacturer Tech Info website:
EU Specific Technical Information Website Unavailable


View Manufacturer OBD/Error Code List

Auto Diagnostics

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Generic OBD Error Code Details for P0421

Warm Up Catalyst Efficiency Below Threshold

What does this mean?

OBD Code P0421refers to
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms

Possible sumptoms of OBD code P0421
You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

Causes

Possible causes of OBD code P0421
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

Possible Solutions

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.

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