P2098: Post Catalyst Fuel Trim System Too Lean (Bank 2)
Key takeaways
- P2098 means the oxygen sensor after the catalytic converter on bank 2 reads leaner than the computer can correct for with its fine trim.
- Bank 2 only exists on V6, V8 and flat engines; it is the side without cylinder 1.
- An exhaust leak ahead of that sensor and a pending engine-software update are the first things to check; a catalytic converter is the least likely and most expensive answer.
- The car is usually safe to drive while you get it checked, unless it also runs rough, misfires or sets P0174.
What P2098 means
The oxygen sensor behind your catalytic converter on bank 2 is seeing more oxygen than it should, and the engine computer can’t fix it with its fine adjustment. Scanners call it Post Catalyst Fuel Trim System Too Lean (Bank 2). The computer sets the fuel mixture mainly from the sensor in front of the converter, then uses the sensor after the converter to trim it slightly. When that rear correction hits its limit on the lean side, P2098 sets. Bank 2 is the side of a V6, V8 or flat engine without cylinder 1; four-cylinder inline engines don’t have one.
Is it safe to drive?
Yes, usually. P2098 on its own rarely changes how the car drives, though fuel economy can drop a little. Get it checked within a few weeks, because a long-running lean condition can overheat and shorten the life of the converter. What changes the answer: a flashing check engine light, a misfire, or a rough idle. Then drive only as far as a shop. The can I drive with the check engine light on guide covers the general rules.
Causes, ranked
| Cause | How you confirm it | Typical cost (US independent shop, 2026) |
|---|---|---|
| Exhaust leak ahead of the rear sensor | Ticking at cold start, soot at a joint, smoke test of the exhaust | $150–$600 (gasket, flex pipe); manifold $500–$1,200 |
| Engine computer software | A bulletin for your car calls for a reprogram | $100–$200, often $0 under warranty |
| Aging upstream oxygen or air-fuel sensor on bank 2 | Slow or offset response on live data | $150–$400 per sensor |
| Downstream oxygen sensor, wiring or contamination | Stuck or low voltage on live data, often with P0157; oil on the sensor | $150–$400 per sensor |
| Engine running lean (vacuum leak, weak fuel delivery) | Positive fuel trims, often with P0174 | $50–$400 for hoses or intake gaskets |
| Catalytic converter | Other causes ruled out; often with P0430 | $1,000–$2,500 |
Software sits higher here than on the bank 1 version because so many of the bulletins for this code are reprograms.
What to check first
- Check for a bulletin on your exact car before buying parts. For this code it is the most common factory fix.
- Exhaust leaks next. Listen at cold start, look for black soot at joints and the flex pipe, and have a shop smoke-test the exhaust. Even a small leak upstream of the rear sensor pulls in air on each exhaust pulse.
- Look at all the codes. P2098 with P0174 points to an engine-side lean condition; with P0157 it points to the rear sensor or its wiring; with P2096 on both banks, think software or something both sides share.
- Live data on both bank 2 sensors. A shop compares how the front and rear sensors respond to a snap of the throttle, and confirms each plug goes to the right bank.
- Clear it and drive after a leak, sensor or software repair. If it stays off for a week of mixed driving, the fix worked.
- Converter last, only after everything above checks out.
The bulletins lean heavily on software. Kia (2014–2015 Sorento 3.3L) and Genesis (2021–2022 G80 3.5L) issued engine computer updates, Jeep has a PCM reflash for the 2015 Grand Cherokee, and Ford has bulletins on 2016 3.5L EcoBoost Explorer, Flex, MKT and Transit models and on the 2021 F-150 and Bronco. Nissan found bank 1 and bank 2 sensor wiring swapped on some 2020 Titans, and GM notes that on 2014–2017 Corvettes an on-off-on tapping of the throttle to hold speed can set P2096 and P2098.
What it costs
The cheap outcome is a software update at $100 to $200, often free under warranty. The common outcome is an exhaust leak repair or an oxygen sensor at $150 to $600. The expensive outcome is a catalytic converter at $1,000 to $2,500, which is rarely the real answer for this code. A bulletin check, a smoke test and a look at live sensor data cost far less than guessing, and the check engine light guide explains what to ask for.
Related codes
P2098 often comes with P2096 when software or a shared problem affects both banks, with P2099 on cars that swing both ways, and with P0174 when the engine itself is lean on bank 2. Only 2 complaints filed with NHTSA mention P2098; those are owner reports, not confirmed causes. The bulletins, 42 of them from 12 makes, are the better guide for this code.
What owners report to NHTSA
2 complaints filed with NHTSA mention P2098, 2 of them since 2015, across 2 different models. The component owners most often filed it under: unknown or other.
Manufacturer service bulletins that name P2098
42 technical service bulletins and manufacturer communications filed with NHTSA mention P2098, from 12 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- GENESIS G80 (2021, 2022), bulletin 10253054: This bulletin provides information related to the ECM(Engine Control Module) software update for 3.5L GDI engine equipped vehicles that experience check engine light, no drivability issue, and with either of the followin…
- FORD F-150 (2021), bulletin 10201626: Some 2021 F-150 vehicles equipped with a 2.7L EcoBoost, 3.3L or a 5.0L engine may experience an illuminated malfunction indicator lamp (MIL) and diagnostic trouble codes (DTC) P2096 and/or P2098 stored in the powertrain …
- FORD BRONCO (2021), bulletin 10202712: Some 2021 Bronco vehicles equipped with a 2.7L EcoBoost engine and built on or before 01-Sep-2021 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P2096 and/or P2098 stored …
- NISSAN TITAN (2020), bulletin 10180994: 2020 TITAN/TITAN XD; MIL ON WITH P2096, P2097, P2098 OR P2099 STORED SERVICE INFORMATION If the following DTCs are stored together, it is possible that the O2 sensor harness routing at the transmission has been unintenti…
- VOLKSWAGEN ATLAS (2018, 2019), bulletin 10172979: Moving DTC codes P0456, P2096, P2097, P2098, P2099 to Technical Bulletin 2058272.
- CHEVROLET CORVETTE (2014, 2015, 2016, 2017), bulletin 10113400: This Preliminary information communicates Customers may experience MIL Illumination with a repaet diagnostic codes P2096 P2098. These code can be set when the driver drives digitally when they tap the accelerator pedal (…
Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.
Frequently asked questions
Can I drive with P2098?
Usually yes. On its own P2098 rarely changes how the car drives. Get it checked within a few weeks, because a lean condition can slowly hurt the converter. If the engine misfires, runs rough or the light flashes, drive it only to a shop.
What is the difference between P2096 and P2098?
Same fault, different side of the engine. P2096 is the sensor after the converter on bank 1, the side with cylinder 1; P2098 is the same sensor on bank 2. If both set together, look for something both sides share, like software or a big intake leak.
Will a new catalytic converter fix P2098?
Rarely on its own. Exhaust leaks, oxygen sensors, vacuum leaks and software updates are far more common fixes, and replacing a converter without finding a leak often brings the code straight back.
Can swapped O2 sensor wiring cause P2098?
Yes, after work near the transmission or exhaust. Nissan found bank 1 and bank 2 sensor harnesses routed to the wrong sides on some 2020 Titans. If P2098 showed up right after a repair, check that each plug goes to the right sensor.