First you have to tell us whether you have automatic temp control or a manual system. They use different blower motor controls.
Before spending any money why not check out the motor brushes. If worn fan will not operate at any speed.
SOURCE: 98 Nissan Pathfinder Brakelight switch locaiton
Look up arm of brake pedal for a switch that gets depressed when pedal is pushed. Probably near top.
SOURCE: I was told I need
TPS Sensors issues, are common on all vehicles.
Yes, you could misdiagnose anything, on todays high tech vehicles,if you don't know the components,how they work and how they function in a system. If the sensor wasn't tested at all,you need a new mechanic. Even the pros throw parts at it.
If the TPS needs replacing, you can do it yourself. Go to the auto parts store and buy it. Look it up on NAPA site or others. About $75.00. Too easy, to pay someone to do.
A scanner code doesn't mean replace something. That was were you were going with your question. Always test,then replace. Test,not scan
Do this. Go to a shop,stand next to your vehicle, and have somone test it in front of you,not scan the system,actually test the TPS. Back probe it and put a Meter or Oscilloscope on it.
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