DTC P2098, P2099
DTC P2098 : Post Catalyst Fuel Trim System Too Lean (Bank 2)
DTC P2099 : Post Catalyst Fuel Trim System Too Rich (Bank 2)
NOTE:
- Before you troubleshoot, review the general troubleshooting information .
- If any of the DTCs listed below are stored at the same time as DTC P2098 and/or P2099, troubleshoot those DTCs first, then recheck for P2098 and/or P2099.
P0150, P0153, P1174, P2197, P2A03: Front A/F sensor (Sensor 1, Bank 2)
P0154: Front A/F sensor (Sensor 1, Bank 2) heater
P0157, P0158, P0159, P2272, P2A04: Front secondary HO2S (Sensor 2, Bank 2)
P0161: Front secondary HO2S (Sensor 2, Bank 2) heater
P0174, P0175: Fuel system
P0204, P0205, P0206: No. 4-No. 6 cylinder Fuel injector(s)
P0300: Random misfire
P0304, P0305, P0306: No. 4-No. 6 cylinder misfire
P0354, P0355, P0356: No. 4-No. 6 cylinder Ignition coil
P219B: Front bank cylinder A/F variation
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P2098 Post Catalyst Fuel Trim System Too Lean (Bank 2) | ||
| P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2) |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Start the engine.
-4. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
-5. Test-drive the vehicle under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)
- Transmission in D
- Engine speed below 4, 000 rpm
- Vehicle speed between 15-75 mph (24-120 km/h) for 1 minute or more
Signal Current conditions Values Unit ECT SENSOR 1 ENGINE SPEED VEHICLE SPEED -6. Monitor the OBD STATUS for DTC P2098 and/or P2099 with the HDS.
DTC Description OBD STATUS P2098 Post Catalyst Fuel Trim System Too Lean (Bank 2) P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2) Does the HDS indicate FAILED?
YES
The failure is duplicated. Go to step 2.
NO
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the front A/F sensor (Sensor 1, Bank 2), front secondary HO2S (Sensor 2, Bank 2), and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot . If the HDS indicates EXECUTING, keep the test conditions until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-5 and recheck.
- Exhaust system check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check for leakage, clogging, or blockage in the exhaust system.
Is there leakage in the exhaust system between the front A/F sensor (Sensor 1, Bank 2) and front secondary HO2S (Sensor 2, Bank 2), or any clogging or restrictions in the exhaust system?
YES
Repair or replace the exhaust system .
NO
Go to step 3.
- A/F sensor (Sensor 1) check (substitution)
-1. Substitute a known-good front A/F sensor (Sensor 1, Bank 2) .
-2. Reconnect all connectors.
-3. Turn the vehicle to the ON mode.
-4. Reset the PCM with the HDS .
Reset PCM
-5. Do the PCM idle learn procedure .
-6. Start the engine.
-7. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
-8. Test-drive the vehicle under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)
- Transmission in D
- Engine speed below 4, 000 rpm
- Vehicle speed between 15-75 mph (24-120 km/h) for 1 minute or more
Signal Current conditions Values Unit ECT SENSOR 1 ENGINE SPEED VEHICLE SPEED -9. Monitor the OBD STATUS for DTC P2098 and/or P2099 with the HDS.
DTC Description OBD STATUS P2098 Post Catalyst Fuel Trim System Too Lean (Bank 2) P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2) Does the HDS indicate PASSED?
YES
Replace the original front A/F sensor (Sensor 1, Bank 2) .
NO
If the HDS indicates FAILED, replace front secondary HO2S (Sensor 2, Bank 2) . If the HDS indicates EXECUTING, keep the test conditions until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3-8 and recheck.