Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1396/17804 - Engine Speed Sensor Missing Tooth
1996 Audi A4 Base, StandardSECTION DTC P1396/17804 - Engine Speed Sensor Missing Tooth
NOTE:
DTC is set when engine speed sensor does not supply 270 engine speed pulses per engine revolution.
Remove starter. Visually inspect starter ring gear. Replace starter ring gear if broken teeth are found. Erase DTC memory and test drive vehicle.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.