P03AE
Cylinder 3 Pressure Too Low
Generic OBD-II
Common symptoms
What you'll notice
- Replace spark plug in cylinder 3
- Clean or replace fuel injector in cylinder 3
- Check and repair any vacuum leaks in cylinder 3
- Perform a compression test on cylinder 3 and repair any issues found
Common causes
Most likely first
- Faulty fuel injector in cylinder 3
- Low compression in cylinder 3
- Ignition misfire in cylinder 3
- Fuel system problem (e.g. clogged fuel filter) affecting cylinder 3
- Faulty engine control module (ECM) causing incorrect fuel delivery to cylinder 3
How to diagnose & fix
Work through it in order
- Rough or uneven engine idle
- Loss of power or acceleration
- Misfires or engine stalling
- Increased fuel consumption
- Check engine warning light illuminated
Read & clear P03AE yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.