Question about 1999 Toyota 4Runner

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I have Toyota 4 runner 1999 limited and I find eginen light on and find 2 code 1-P0420 2-P0420(pd) Could you tell me what they main

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Toyota is great they try to make things fool proof. taken from http://www.ask.com/answers/72103781/firing-order-for-a-1999-toyota-4runner-3-4 : The firing order for a 1999 Toyota 4 runner 3.4l is 1-2-3-4-5-6. When standing in front to your car, the left bank of the cylinders are numbered 1, 3 and 5 while on the right they are numbered 2, 4 and 6.


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