Lexus GX 2004-09 :: CEL Came On And Engine Was Running Really Rough


Jul 8, 2013

So I've been sick for the past few days and my GX has been sitting in the driveway. I finally started it up on Sunday to run some errands and the CEL came on and the engine was running really rough. So I took it up to the dealership and had them pull the codes. It was showing a problem with the knock sensor.

I had to leave it until today so they could diag it further and see what the real problem was. Turns out I have a freaking rat in my engine and it ate my wiring harness. The service tech told me he jumped back when he took off the engine cover and saw an 8 inch rat scurry away. It is now sitting out in the lot until they get the rat out because they don't want it loose in the garage.

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I realize that 300 is a general misfire code and 303 is a misfire code for cylinder 3 and 304 is for cylinder 4. After reading some advice on here 4 months ago, I cleaned my MAF sensor, ran some fuel injector cleaner through a tank of fuel, replaced all 4 spark plugs, and started buying Chevron gas. The CEL stayed off and our mileage went back to normal. I thought I had solved the problem but now this after 3000+ miles. I checked all the ingitors, connections, spark plugs, and wires yesterday and all seem to be in good condition. Maybe they were right and the fuel injectors are going bad. I am at a loss as what else to do other than take it back to the dealer now and plan do that this afternoon.

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Transmission was rebuilt at around that time also.

I only drove it to Autozone and back today to post the code and see what everyone's opinion is as to what's wrong.

Here's what the printout says : P0171 "Fuel Trim Bank One Condition"

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