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- Sun Jan 04, 2009 5:59 am
- Forum: Problems & Warranty Issues
- Topic: DTC P0420 - No Driveability Issues
- Replies: 93
- Views: 69226
bought an '03 with 120M miles, throwing a p0420. Sensor test indicated bad post cat sensor. Replaced with BOSCH sensor - still got the code. Toyota dealer said it was the cat - replaced it(groan) still got the code. I pulled the plugs - they were fried - replaced em - and the CEL is now gone. Sugges...