Hopefully you all can double check my madness and lack of dealer support
2002 Toyota Camry
2AF-FE motor 2.4L
5 speed manual trans
approx 167500 miles
oil change / filter change every 3000 miles
The P0420 code tripped off about 2 months ago. It reads Catalyst System Efficiency Below Threshold (Bank 1)
The local Toyota dealer sates the first catalytic converter to be changed out.
About a week later the same code goes off. Back to the dealer. This trip the dealer changes the Variable Valve Timing. Then after a few hundred mile trip the code comes back. This is the point I found the nation. Searching here I have replaced the Mass air flow sensor and the bank 1 O2 sensor. Code was clear for about a week. I did the O2 spacer on bank 2. This lasted over 2 weeks with almost all freeway miles. I also used B12 chemtrol at this time.
Now after a long freeway trip and some town mileage the code is back.
The car is getting normal gas millage. Drives every day. Id say 40% is freeway miles.
I thought about changing the fuel filter and screen. Toyota states the filter is lifetime unlimited mileage. The spark plugs have been changed month prior to the code showing up.
The coil packs are factory and I have had no codes for them
This weekend I'm going to clean the throttle body. I doubt it is the issue.
I have read where the ECU may need to be flashed. My local dealer has not looked into that.
Is there any other things I can do before going back to the dealer?
2002 Toyota Camry
2AF-FE motor 2.4L
5 speed manual trans
approx 167500 miles
oil change / filter change every 3000 miles
The P0420 code tripped off about 2 months ago. It reads Catalyst System Efficiency Below Threshold (Bank 1)
The local Toyota dealer sates the first catalytic converter to be changed out.
About a week later the same code goes off. Back to the dealer. This trip the dealer changes the Variable Valve Timing. Then after a few hundred mile trip the code comes back. This is the point I found the nation. Searching here I have replaced the Mass air flow sensor and the bank 1 O2 sensor. Code was clear for about a week. I did the O2 spacer on bank 2. This lasted over 2 weeks with almost all freeway miles. I also used B12 chemtrol at this time.
Now after a long freeway trip and some town mileage the code is back.
The car is getting normal gas millage. Drives every day. Id say 40% is freeway miles.
I thought about changing the fuel filter and screen. Toyota states the filter is lifetime unlimited mileage. The spark plugs have been changed month prior to the code showing up.
The coil packs are factory and I have had no codes for them
This weekend I'm going to clean the throttle body. I doubt it is the issue.
I have read where the ECU may need to be flashed. My local dealer has not looked into that.
Is there any other things I can do before going back to the dealer?