At 04:21 PM 2/20/05, you wrote:
>After getting a "CHECK ENGINE LIGHT" I went to Auto Zone and had the
>code pulled. They said it was a P0420. The print out gave the following:
>The PCM has determined that the catalyst system efficiency for Bank 1 is
>below threshold for the current engine operating conditions. (Bank 1
>identifies the location of cylinder #1, while Bank 2 identifies the
>cylinder of the opposite Bank). They were not very helpful in
>identifying possible solutions. Any ideas? Thanks Bob 99 Dakota
Do you happen to know what in the VIN identifies a Dakota truck?
At any rate, I'll give you what Chrysler says for Vins F, Y.
The post cat O2 sensor has triggered this code.
Conditions:
Engine running for at least 3 minutes.
Closed loop operation.
Coolant temp. greater than 150 degrees
The code was set because the pcm detected the catalyst sensor"s
switch rate (I have no idea what this is nor that we have one) was too
close to that of the O2 sensor's switch rate.
Testing requires use of very high end scanner to monitor both of these
signals after injecting some propane into the throttle intake.
The code usually means that cat converter is bad :-( I don't know
how this fits in with the history of your truck. HTH.
The oldest Bob :-)
This archive was generated by hypermail 2b29 : Tue Mar 01 2005 - 10:04:31 EST