How do I start a car with a damaged crankshaft sensor?

When the crankshaft position sensor (CKP) is damaged, the engine ECU cannot receive crankshaft speed and position signals, causing most EFI vehicles to fail to start. If this happens, try the following workarounds:

1. Tap Reset Method
After turning off the ignition, gently tap the sensor housing (located near the crankshaft pulley) with a wooden stick. This may temporarily restore contact. This method may be effective for poor internal sensor contact.

2. Emergency Start Mode
Some older vehicles (such as carbureted vehicles before 2000) can be forced to start by pressing the accelerator to 1/3, but this success rate is extremely low with modern EFI vehicles.

3. Tow Start (Manual Transmission Only)
Shift the vehicle into third gear, depress the clutch, and tow the vehicle to 20 km/h. Then, suddenly release the clutch. Using the wheels to pull the crankshaft in reverse may trigger the ECU's emergency fuel supply procedure. However, please note:
This attempt is strictly prohibited in automatic transmission vehicles.
After a successful start, repair the vehicle immediately.
This may damage the catalytic converter.

Important Tips:
• Oxidation of the sensor plug can also cause similar problems; you can try cleaning the plug.
• Long-term use can disrupt the injection/ignition timing and damage the engine.
• It is recommended to call a professional for assistance and replace the original sensor (repair costs typically range from 500 to 1500 yuan).

The safest option is to replace the sensor promptly. Modern vehicles have complex electronic systems, and forced starting can cause even greater damage.