What to Do If the Engine Speed Sensor Has Missing Teeth?
2 Answers
Check the crankshaft position sensor for any foreign objects and inspect the flywheel for scratches. Oil Level Check: If this fault code appears, first check the oil level. If the oil level is below the minimum mark, top up the oil. Professional technicians and tools are required to diagnose this fault code. If this issue occurs, please contact a professional technician. Usage Tips: For automatic transmission vehicles, do not overly focus on acceleration speed. If the gear shifts late, avoid stomping on the accelerator, as this will only produce the opposite effect. When starting, firmly press the brake, shift the gear lever into drive, wait for 0.5 seconds until you feel a slight vibration from the vehicle, then proceed to start.
That time my car had this issue, the engine idled so rough it was shaking badly. Upon inspection, I found a missing tooth on the speed sensor gear, causing erratic signals that messed up the ECU's fuel control. I quickly took it apart and saw severe gear wear, probably from accumulated grime that wasn't cleaned regularly. Temporarily fixed it with glue, but the car still ran unsteadily—only replacing the part solved it. My advice: first check the gear condition. If wear is minor, cleaning or minor repairs might work; if it's badly damaged, replace the entire sensor component. It's safest to visit a professional repair shop—they have the tools for proper calibration, and DIY attempts could risk ECU damage. Regular maintenance, like cleaning around the sensor area, can prevent this problem.
