The engine management light had come on and been reset twice with around a month before the light came on. I can't be absolutely sure what the code was but it was sensor related both times. So I asked the Toyota Dealer to have a look when it went in for the MOT. At that point the light was off. Dealer reported:
"Engine Management Light comes on intermittently - carry out diagnostic 0.40 check - P0420 Catalyst stystem below threshold (Bank 1) carry out checks to O2 sensor - Bank 1 sensor out of spec. Delete fault code and road test."
Advised that removing old sensor could be difficult if lots of corrosion and could be more than car is worth in worst case. Suggested delay repair until I was experiencing problems with fuel economy or performance.
The very next day the light came on again. It has been on ever since (1 month) until..
I removed filler cap - heard a hissing as if there was pressure in the tank and refilled tank. When I got back in car light was off and has remained off for the past week.
Could a vacuum/excess pressure in the fuel tank be causing the light to come on with that code?
What next?
I am thinking that maybe I should buy an ELM327 v2.1 bluetooth OBD dongle and software and see what I can discover. I guess a cheap one from ebay is as good as any for my needs?
That said my wife's Chevrolet tacuma has an ABS light coming on intermitently and local garage could not drill down to discover exact fault. So I would pay a bit more for a more flexible scanner.
RAV4 XT3 5dr 2.0 VVT-i Auto April 2004
"Engine Management Light comes on intermittently - carry out diagnostic 0.40 check - P0420 Catalyst stystem below threshold (Bank 1) carry out checks to O2 sensor - Bank 1 sensor out of spec. Delete fault code and road test."
Advised that removing old sensor could be difficult if lots of corrosion and could be more than car is worth in worst case. Suggested delay repair until I was experiencing problems with fuel economy or performance.
The very next day the light came on again. It has been on ever since (1 month) until..
I removed filler cap - heard a hissing as if there was pressure in the tank and refilled tank. When I got back in car light was off and has remained off for the past week.
Could a vacuum/excess pressure in the fuel tank be causing the light to come on with that code?
What next?
I am thinking that maybe I should buy an ELM327 v2.1 bluetooth OBD dongle and software and see what I can discover. I guess a cheap one from ebay is as good as any for my needs?
That said my wife's Chevrolet tacuma has an ABS light coming on intermitently and local garage could not drill down to discover exact fault. So I would pay a bit more for a more flexible scanner.
RAV4 XT3 5dr 2.0 VVT-i Auto April 2004