Items you will need Socket wrench Socket set. If there is an underlying problem, the codes will reappear and should be investigated as soon as possible. Tip Resetting the codes only wipes the memory of the ECU. Start the truck and ensure the "Service Engine" light is gone. Step 4 Tighten the cable back on to the terminal. Step 2 Unscrew the negative cable on the battery. Step 1 Open the hood for access to the engine compartment. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. The negative terminal is indicated by the "-" symbol in front of the post. Unscrew the negative cable on the battery. Locate the battery on the front of the engine on the battery side. Open the hood for access to the engine compartment. This is best done after any repair work to ensure the codes stay gone as they will come back as soon as the ECU reads a faulty code or experiences an engine problem. When replacing sensors and performing maintenance on a Toyota Tundra, the engine control unit may not turn the indicator light off.
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