Rough idle

1996 MAZDA PROTEGE
260,000 MILES
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DWALKORD9
  • MEMBER
  • 1 POST
My code said PO120 or bad throttle position sensor but I replace it and it still has that code. What should I do now?
Apr 18, 2013 at 7:56 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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CARADIODOC
  • CAR REPAIR CONTRIBUTOR
  • 34,308 POSTS
Diagnostic fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. In the case of the TPS you must first do a visual inspection of the wiring and terminals in all connectors. If nothing obvious is found the next step is to measure the voltages on all of the wires with the sensor still plugged in. The voltage readings will indicate whether the sensor is defective or there is a hidden wiring problem.
Apr 18, 2013 at 10:20 PM
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