Originally Posted by guam toy
I've got a problem with my 2001 awd l rav 4. I have poor fuel economy, low rpm, and bogging out at 40 mph. I got it diagnosed and it said that I'm misfiring on cylinders 1,3,and 4. also my o2 sensor. the check engine light is flashing. I've tried replacing the plugs and the filter. I also dropped the oil gasket and cleaned that. M y friend said that the o2 sensor is my problem, but over here they cost $100 to $240 for the low side. I'm not sure if its the o2 sensor thats causing the so many cylinders to misfire or if its something else. Also befoe the problem I switched from gasing premium to regular unleaded. Any advice or comments to help me out please?
It sounds if your coil packs could be defective, The flashing Check Engine light is that your CAT is over heating due to Raw fuel entering the CAT because of the missfire..
If #2 cylinder is performing OK then switch the coils around and see if it missfires on #2 cylinder after the swap.
Also an O2 sensor will not cause a missfire BUT can cause driverability problems..
If you need some coils then check herehttp://cgi.ebay.co.uk/TOYOTA-GENUINE...QQcmdZViewItem