OBD-II code · Powertrain (generic, extended)
P2BA4 Catalyst Feedgas Performance
The ECM detects that the exhaust gas composition reaching the catalyst (feedgas) deviates from the calibrated profile. Pre-cat O2 measurement and air-fuel control are inconsistent with engine operation.
Is it safe to drive with P2BA4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLong-term fuel trim drifted out of nominal range
- PossibleExhaust leak upstream of catalyst
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Catalytic Converter, O2 Sensor Pre Cat, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.