Background: 2006 2.4L RAV4, 229,000 miles. I have searched through the forums on this site and had multiple hits on the CEL code P0420 but not (yet) found the help I need. Plus I dealt with the issue of a failed cat less than 2 years ago. I'm using an ELM327 wifi OBD-II reader coupled with DashCommand to attempt to diagnose the current issue. I've included 3 screen shots from DashCommand showing what I hope is relevant data (ignore the 3 "Quick Gauges" on one of the screen shots. The focus of that screen shot is the O2 sensor voltages.) These screenshots were taken after approx. 20 minutes of driving at as close to steady state 55 MPH as possible.
The newest occurrence of the P0420 happened a week ago. There were no additional codes. I reset the CEL, and after 2 or so drive cycles it reappeared. There are no new/noticeable driving issues with the vehicle (rough running, misfire, stalling, etc). This vehicle does consume approx 1 qt oil per 1,000 miles. I've had the oil consumption test done but it "passed".
Relatively recent maintenance that has been done that may be relevant:
Given the low mileage on the cat I am wondering about a failed AFR (upstream O2) sensor or O2 (downstream) sensor. Note that DashCommand shows no data for the O2 sensor. For those familiar with DashCommand, I have done an aggressive PID detection.
I would appreciate any help in next steps diagnostics.
Thanks!
The newest occurrence of the P0420 happened a week ago. There were no additional codes. I reset the CEL, and after 2 or so drive cycles it reappeared. There are no new/noticeable driving issues with the vehicle (rough running, misfire, stalling, etc). This vehicle does consume approx 1 qt oil per 1,000 miles. I've had the oil consumption test done but it "passed".
Relatively recent maintenance that has been done that may be relevant:
- New spark plugs at 204K miles
- New ECM at 208K miles
- New cat at 208K miles
- Cleaned/inspected MAF sensor at 229K miles
- Cleaned/inspected PCV valve at 229K miles
I would appreciate any help in next steps diagnostics.
Thanks!
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