|12-15-2008, 08:28 PM||#1|
Join Date: Dec 2008
2007 Wrx limited WRB
07 FXT WRB,'15 model S
CEL P0420 + shift RPM question (5th to 6th)
So I've only had my 04 STI for a bit over a week now so I'm still getting used to the beast In that week + a couple days I've thrown my CEL almost every day. I had the code pulled and it was P0420. Depending on responses a trip to the dealership is around the corner but posting this question here first.
What RPM/speed do you shift from 5th to 6th? My previous car was a BMW which had more torque so I just always shifted low and was in the highest gear possible. I've noticed when I throw the CEL I've ended up being in 6th gear at 60MPH or just below (maybe 55mph or so by mistake).
Am I just lugging down the motor thus causing the CEL because of my habbit to be in the top gear on the freeway or does this sound like a problem with my O2 sensor? The car only has 31K miles on it so I highly doubt its the CAT thats the problem which leaves me thinking its the O2 sensor.... Or maybe my driving thats at fault
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Last edited by Screwbal; 12-15-2008 at 08:40 PM. Reason: formatting
|12-15-2008, 08:51 PM||#2|
Join Date: Jul 2002
Chapter/Region: E. Canada
Location: National Capital RegionVehicle:
it's just that the ECU performs the catalyst efficiency check at that particular cruising RPM
nothing to do with your shift habits
the most common cause of that code is running a catless aftermarket downpipe - if your car is stock then yes a failing cat is the 2nd most common
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