OBD-II code · Powertrain (generic, extended)
P2198 O2 Sensor Signal Stuck Rich (Bank 2, Sensor 1)
The upstream oxygen sensor on bank 2 returns a constant rich signal under deceleration fuel cut-off where lean is expected. Often a contaminated sensor (silicone, oil, coolant) or short to ground that pulls the signal high in some sensor types.
Is it safe to drive with P2198?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyUpstream sensor contaminated
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Upstream
Related codes
- P2196O2 Sensor Signal Stuck Rich (Bank 1, Sensor 1)
- P2271O2 Sensor Signal Stuck Rich (Bank 1, Sensor 2)
- P2273O2 Sensor Signal Stuck Rich (Bank 2, Sensor 2)
- P2195O2 Sensor Signal Stuck Lean (Bank 1, Sensor 1)
- P2197O2 Sensor Signal Stuck Lean (Bank 2, Sensor 1)
- P2199Intake Air Temperature Sensor 1/2 Correlation
- P219ABank 1 Air-Fuel Ratio Imbalance
- P219BBank 2 Air-Fuel Ratio Imbalance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.