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P0420 cel on my 2002 rx 300. Help needed

p0420 rx 300

By sa3ma4na
October 15, 2016 in RX 300 / RX 350h / RX 400h / RX 200t / RX 450h+ / RX 500h Club

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sa3ma4na

Posted October 15, 2016

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Posted October 15, 2016

I bought this car about 3 weeks now and it's throwing P0420 code. I had the freeze frame screen shot on my torgue Bluetooth scanner attached. I need the techs in the house to try to decipher what the problem could be. I am also adding pictures of my oxygen sensor and af sensors scan tool data. I need to solve this code quickly as it's affecting my fuel consumption

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Verbout

Posted October 15, 2016

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Posted October 15, 2016

Work your way through these issues, easiest first.

https://www.obd-codes.com/p0420

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Grand Master

PCM

Posted October 15, 2016

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Posted October 15, 2016

Did you buy from a dealer you can take it back to?

Or a quick visit to Lexus, maybe?

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sa3ma4na

Posted October 16, 2016

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Posted October 16, 2016

I didn't buy from a dealer. Where are the techs in the house who can help diagnose what my problems are from the above readings

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ChrisKaye

Posted October 17, 2016

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Posted October 17, 2016

You are in closed loop, the vehicle hasn't switched to using the O2 sensors to adjust trim.

You also need to let it complete a few drive cycles as you reset the error codes so it is showing some data as 'incomplete'.

Sent from my Iphone using Tapatalk

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