P01A2
Alternative Fuel Tank A Pressure Sensor Circuit Intermittent/Erratic
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections to the alternative fuel tank A pressure sensor
- Inspect and clean the alternative fuel tank A pressure sensor
- Replace the alternative fuel tank A pressure sensor
- Verify the fuel tank pressure using a fuel pressure gauge
Common causes
Most likely first
- Faulty or malfunctioning alternative fuel tank pressure sensor
- Loose or corroded electrical connections to the alternative fuel tank pressure sensor
- Clogged or restricted fuel lines leading to the alternative fuel tank
- Damaged or leaking alternative fuel tank
- Issues with the vehicle's engine control module (ECM) or powertrain control module (PCM)
How to diagnose & fix
Work through it in order
- Check engine light is illuminated on the dashboard
- Loss of power or decreased acceleration
- Poor fuel efficiency
- Difficulty starting the vehicle
- Rough idle or stalling of the engine
Read & clear P01A2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.