Installed New Throttle Body And Now Getting HORRIBLE Fuel Mileage
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Joined: Nov 2018
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O2 sensors age, and become less accurate over time. That, and crap builds up on them, which contributes to inaccuracy.... but, so long as the signal is doing what the PCM thinks it should, they won't set codes. Replacing them isn't a bad idea, at least the front sensors..... it may or may not help though. NTK or Denso sensors only please. These trucks don't like the other guys.