2007 Prius 100k - Catalytic Converter was stolen and replaced with non-OEM CAT six weeks ago. the O2 sensor was also replaced. P420 code came up yesterday. The car does not burn oil...yet What's the best fix for this? 1) replace O2 sensor with a OEM Denso sensor 2) use a "cheater"/extension/bung on the O2 sensor - part number? any other ideas?
Are the local smog techs looking for OBD2 codes reported, or will they check under the car and down the firewall as well?
I'm in Illinois - Emission testing in this state is a joke - they only check if you have any OBD2 codes. They do not check under the car or inspect the CAT. (i think that's what you're asking).
Get a cat that works. Magnaflo is the brand I used in California. It was illegal at the time but place I test at just looks for codes. It's passed 3 times with no codes. Posted via the PriusChat mobile app.
If @audiodave s suggestion is not clear or undesired for your 15 year old - maybe this will help give you an idea or two what to start checking and / or changing to clear the p0240 P0420 . Understanding and diagnosing Toyota P0420 DTC | 2012-06-20 | Auto Service Professional
If DIY then trying the extender would be the cheaper option, though I've never used one myself. If that doesn't work, you could try the denso o2 sensor for 50 or less (Carid will pricematch any retailer) : More Information for DENSO 2344623 Is the current installation leak free? Is the vehicles mileage accurate? Which non-oem cat did you use, and do you have access to techstream?
