Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- Carefully inspect for any exhaust leaks between the upstream and downstream sensor of the affected bank.
- The most likely cause for this DTC is a deteriorated or contaminated HO2S 1.
- Depending on the state of the HO2S deterioration, this code may not reset, or may be very difficult to reset.
- If the HO2S deterioration is significant enough, other HO2S DTCs may set or be present in concurrence with this DTC.
- Attempt to compare the activity of both the affected bank HO2S 1 and HO2S 2 to the known good bank using the live plot feature of the scan tool. Operate the vehicle under various load and vehicle/engine speed conditions. Look for any indication of improper operation or contamination of the affected bank HO2S 1 or HO2S 2.
- For an intermittent condition, refer to Intermittent Conditions .
DTC P2096 or P2098
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views |
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| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 3 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | If DTC P1137 or P1157 are also set, diagnose those DTCs first. Is DTC P1137 or P1157 also set? |
- | Go to DTC P1137 or P1157 | Go to Step 3 |
| 3 | Cycle the throttle from idle to wide open throttle (WOT) 3 times within 5 seconds while observing the HO2S Bank 1 Sensor 2 or HO2S Bank 2 Sensor 2 parameter with a scan tool. Does the voltage react immediately to the above action? |
- | Go to Step 4 | Go to Step 5 |
| 4 |
|
- | Go to Step 5 | Go to Diagnostic Aids |
| 5 |
|
25 mV | Go to Step 6 | Go to Step 7 |
| 6 |
|
25 mV | Go to Step 2 of DTC P0135 or P0155 | Go to Step 8 |
| 7 | Test the HO2S high signal circuit for an open or high resistance. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 9 |
| 8 | Test the HO2S low signal circuit for an open or high resistance. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 9 |
| 9 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 11 | Go to Step 10 |
| 10 | Replace the ECM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 11 | - |
| 11 |
|
- | Go to Step 3 | Go to Step 12 |
| 12 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |