This is dangerous. If you set the wrong fuses, the chip won't boot. Typical settings for ATmega162 @ 16MHz: avrdude -c usbasp -p m162 -U lfuse:w:0xff:m -U hfuse:w:0x91:m (Verify these for your specific crystal oscillator).
Use a multimeter to check the input and output voltage of the 5V/3.3V step-down voltage regulator on the board. If it receives 12V from the car but outputs 0V, replace the regulator chip. 6. How to Prevent Future Clone Bricking vcds 2231 hex v2 clone repair
If it appears, try to run a loader that has a "re-flash" or "update firmware" option. 3. Advanced Repair: Re-flashing the ATMEGA162 This is dangerous