Fuel System/Emissions
Sensors (O₂, or oxygen, sensor), emission-control devices (includes EGR), fuel-injection system, fuel gauge/sender, fuel pump, problems filling up the tank.
What Owners Say
"One of the injectors was plugged"
Anonymous, OR (2000 Toyota Tacoma Base 3.4-L V6)"Check engine light, engine running lean while towing a trailer dealer said it was the mass air sensor: I doubt it"
Anonymous, FL (2000 Toyota Tacoma PreRunner 3.4-L V6)
"The MAF on the truck gets dirty on a regular basis and causes a CEL. I believe I ignored it for far too long and as a result caused the ECU to receive the wrong data and thereby killed my catalytic converter. My fuel vapor pressure sensor also went out at around the same time... not sure if that was related?"
Anonymous, CA (2000 Toyota Tacoma Limited 3.4-L V6)