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Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by Keith Brown on December 8, 2009, 4:13 pm

Year of Manufacture *: 2003
Engine Code or CC *: 1800
( Optional ) Scanner Used: launch

The old favorite p0420!
This vehicle runs perfect, emissions data
co 0 %
HC o ppm
co2 15%
o2 0%
Leak tested ok, scoped both o2 sensors, front sensor activity normall to .8v, rear sensor activity normal flat line under most conditions,the ecm lamp came on again 3 weeks after erasing, I have read about super market fuel causing issues could this realy be a fix?, I have also read about a "re-flash" on the working tolerances of cat performance? your thoughts would be helpfull.

Re: Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by Colin Jelf <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1635' width='330' height='300' border=0 style='border:none;'> on December 8, 2009, 6:57 pm, in reply to "Toyota Avensis 1.8 2003 - Fault code P0420 #"
Colin Jelf

hi keith
its unlikely but an intermittent misfire can trigger this code but more likely to need reflashing which i would assume increases tolerances.
good luck
colin

Re: Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by Nigel Yardley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2837' width='330' height='300' border=0 style='border:none;'> on December 8, 2009, 10:16 pm, in reply to "Re: Toyota Avensis 1.8 2003 - Fault code P0420 #"
Nigel Yardley

We had a similar fault here...
avensis fault

we fitted a new cat and light still out a few months on.....

Re: Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by Dave Hill <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2783' width='330' height='300' border=0 style='border:none;'> on December 8, 2009, 10:45 pm, in reply to "Re: Toyota Avensis 1.8 2003 - Fault code P0420 #"

I wonder if a "Marginaly efficient" catalyst might be further compromised by the cooler ambient temperatures that we see at this time of year?

Something else to consider maybe?

Cheers

Dave

Re: Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by Terry Wood <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2771' width='330' height='300' border=0 style='border:none;'> on December 9, 2009, 9:34 am, in reply to "Re: Toyota Avensis 1.8 2003 - Fault code P0420 #"
Terry Wood

Hello Keith

Like you I have seen this code many times, which usually ends up getting expensive to fix
Although the vehicle doesn't normally display any other symptoms and will fly through a emission test

For the last 2 vehicles I have seen this code on I used a simple extension to move the Post sensor out of the direct flow of gasses

To do this I used an old style ford OHV Spark that I remove the core and welded to a 18mm 1.5 pitch Nut (2 if you have the room) then weld up the end of the spark plug then drill out to 4mm

This then seems to average the sensor output and so far has not brought back on the lights

Not my Idea just read it somewhere and it seems to work

HTH
Terry

Terry@ydhost.co.uk

Re: Toyota Avensis 1.8 2003 - Fault code P0420 #

Posted by keith b <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1429' width='330' height='300' border=0 style='border:none;'> on December 9, 2009, 10:44 am, in reply to "Re: Toyota Avensis 1.8 2003 - Fault code P0420 #"
Keith Brown

Thanks for your replys,dave could be on to something,this fault NEVER occurs to reps,its allways veh that only do town runs and more often have low mileage! terrys fix looks great ,bearing in mind the dealer "re-flash costs",i will probably talk my customer into this mod,worth a try ,nigel this is a single cat version with just two sensors,will post results when done mod thanks.

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