• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under light load conditions at a steady cruise. The engine control module (ECM) constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.
• | Before the ECM can report DTC P2096 or P2098 failed, DTCs P0030, P0031, P0032, P0050, P0051, P0052, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P013A, P013C, P013E, P014A, P0140, P0141, P0150, P0151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P2232, P2235, P2270, P2271, P2272, and P2273 must run and pass. |
• | DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0420, P0430, P0442, P0443, P0455, P0458, or P0459 is not set. |
• | The engine speed is 1,080-3,480 RPM. |
• | The engine load is 18-65 percent and steady. |
• | Closed loop fuel control is active. |
• | The calculated exhaust gas temperature is greater than 250°C (482°F). |
• | DTCs P2096 and P2098 run continuously when the conditions above have been met for greater than 100 seconds. |
The lean correction limit for a condition causing a rich air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.
DTCs P2096 and P2098 are Type B DTCs.
DTCs P2096 and P2098 are Type B DTCs.
An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If any other HO2S or fuel trim DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
• | Rich fuel injectors--Refer to Fuel Injector Solenoid Coil Test. |
• | High fuel system pressure--Refer to Fuel System Diagnosis. |
• | Fuel that is contaminated--Refer to Alcohol/Contaminants-in-Fuel Diagnosis. |
• | Fuel saturation of the evaporative emissions (EVAP) canister |
• | Stuck open or leaking EVAP purge valve |
• | Restricted exhaust |
• | Incorrect PCV system operation |
⇒ | If you find any of the above conditions, repair as necessary. |
Caution: Refer to Road Test Caution in the Preface section.
Important: A road load condition is necessary to obtain closed loop.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.