- 1). Look on the driver's side of the engine, just above and a little behind the crankshaft pulley, and find the crankshaft position sensor.
- 2). Remove the crankshaft position sensor-retaining bolt, using a ratchet, socket and 6-inch extension. Trace the crankshaft position sensor's wiring upward until you find the wiring harness. Insert the blade of a flat-head screwdriver under the harness and pry it outward until its retaining clip unfastens from its bracket.
- 3). Press the locking button on the crankshaft position sensor's wiring harness, and pull the sensor's harness from the engine's harness. Remove the crankshaft position sensor from the Corolla.
- 4). Set a new crankshaft position sensor into the hole that the old sensor was in, and hand-thread its retaining bolt into place. Tighten the sensor's bolt to 6 to 7 foot-pounds, using a torque wrench, socket and 6-inch extension.
- 5). Plug the crankshaft position sensor's wiring harness into the engine wiring harness until it clicks into place. Line the clip on the rear of the sensor's wiring harness up with the hole in the bracket, and press the wiring harness toward the bracket until it clicks into place.
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