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2005 Accord EX Sedan P0420 Error Code

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  #11  
Old 09-03-2012, 06:25 PM
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Originally Posted by TexasHonda
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
My scanner isn't capable of doing that. I'm assuming I can go to O'Reilly and use their scan tool. Since I cleared the data recently, will I need to drive it around for awhile before I get usable data, or is LTFT data not affected when the codes are cleared?
 
  #12  
Old 09-03-2012, 08:06 PM
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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
 
  #13  
Old 09-03-2012, 11:20 PM
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It definitely reads O2 Sensor Data...maybe I'll dig a little deaper and see what else I can get out of it. I've only used it to read trouble codes.

Thanks for the feedback.
 
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