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these codes indicate there is a miss fire on cylinders 1 and 2 hence the 0301 and 0302 code the 1300 just indicates multiple engine miss fires. so anything that can cause these cylinders to miss fire need to be attended to in order to fix your problem.
Check out the AboutAutomobile.com site for NHTSA complaints. I believe there was a defect in the cylinder heads for this engine. The redesigned heads have a different suffix letter than the stock heads.
For a time, the Manufactuer was paying for the repair.
no, the plug is firing. But the timing is off. the plug is firing quite a bit before top dead center on that cylinder. The burning of the fuel mixture is occurring while that piston is on its way up and is slowing it down---dragging down the whole engine. i think you should change the distributor cap and rotor as cylinder one is firing at the same time as cylinder 2or 4. This indicates a possible carbon track in the distributor cap.
Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?
the engine miss fire can cause the other codes to set. you need to repair the miss fire and clear all codes after the miss is repaired then see if the 02 sensor codes return. the miss fire is probably a bad spark plug wire a good tune-up should take care of it ........HAVE A GREAT DAY
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