2005 Accord EX Sedan P0420 Error Code
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Joined: May 2007
Posts: 86
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Check Long Term Fuel Trim (LTFT) w/ an OBD2 scanner. If it's near zero (not sure how near zero but probably < +/- 5%) and not changing, things are fine.
If LTFT is running higher than -5 to -10% or more, then excess fuel is being added and ECU is attempting to compensate.
good luck
If LTFT is running higher than -5 to -10% or more, then excess fuel is being added and ECU is attempting to compensate.
good luck
Super Moderator : And A Texan
Joined: Feb 2007
Posts: 9,652
From: Katy, TX
Are you sure your scanner won't indicate LTFT? I thought I read it was able to read O2 sensor voltage signal? This level of scanner usually will scan all the key outputs.
LTFT will reset, but it doesn't take long to establish a new trend. Perhaps 10-20 mins of driving.
good luck
LTFT will reset, but it doesn't take long to establish a new trend. Perhaps 10-20 mins of driving.
good luck
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