Some scanners might indicate this as "not ready". ![]() The scanner indicated "catalyst monitor incomplete". My first thought was the dealer was right and this is going to be expensive. Everything came back to normal except a system monitor for the catalytic converter. This time I cleared the codes with the scan tool. I had the scanner with me on a trip when the CEL came on so I checked the codes. I purchased my own scan tool to check codes and after about another 2000 miles my check engine light came back on. After that my 4Runner ran like it was brand new and the mileage increased 2 mpg on the highway. I then added Seafoam into a vacuum line per the instructions. When I got home I disconnected the battery to clear the codes and added a can of Seafoam to the gas tank with a full tank of gas. I stop and pick up some Seafoam additive. Then they tell me, "the good news is your sensors are OK, but you actually need two catalytic converters." Again, I thank them for their time and take my 4Runner. I bring it back to the dealer and have them check the sensors. I find out O2 the sensors may be failing from age and if they are unable to deliver the correct information to the ECM, it is possible to get a PO430 or PO420 code. ![]() I then research online to find out more information about this code. They tell me the code PO430 means my catalytic converter is not working to efficiency and needs to be replaced. The dealer charged me $110 to check the code. While driving my V6 4Runner on a highway trip with about 123000 miles on the vehicle, my check engine light and VSC light came on.
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