2021 Alfa Romeo P0135: What It Means & Is It Safe to Drive?
P0135 on the 2021 Alfa Romeo: O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainLow urgency
What this code means
The heater circuit for the upstream O2 sensor on bank 1 has a fault. Sensor may still work but take longer to go closed-loop.
Common causes on the 2021 Alfa Romeo
- Failed O2 sensor (heater element)
- Open or short in heater wiring
Symptoms
- Check Engine Light
- Possible slightly worse fuel economy
Typical fixes
- Replace bank 1 sensor 1 O2 sensor
- Repair wiring
Repair cost range
For a 2021 Alfa Romeo, repairs for P0135 typically fall between $80 and $300, depending on the root cause and labor rates in your area.