DTC P2097:00, P2099:00 [MZI-3.7]

id0102d2922400

DTC P2097:00 DTC P2099:00 | Post catalyst fuel trim system too rich (RH) Post catalyst fuel trim system too rich (LH)
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DETECTION CONDITION | • P2097:00 indicates that post catalyst fuel trim system too rich (RH) • P2099:00 indicates that post catalyst fuel trim system too rich (LH) • The PCM monitors the correction value from HO2S as part of the fore-aft oxygen sensor control routine. The test fails when the fuel decrease correction value is greater than the calibrated limit.
POSSIBLE CAUSE | • A/F sensor connector or terminal malfunction • HO2S connector or terminal malfunction • Contaminated A/F sensor and/or HO2S • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VISUALLY INSPECT A/F SENSOR AND HO2S CONNECTORS • Turn the ignition switch off. • Disconnect A/F sensor and HO2S connector for suspect bank. • Visually inspect for a loose connection, and damaged or corroded terminals • Is a concern present? | Yes | Repair or replace suspect part then go to Step 5.
No | Go to the next step.
4 | INSPECT FOR POTENTIAL SENSOR CONTAMINATION CONCERNS • Investigate the following items as potential sources of A/F sensor contamination: ― Use of unapproved silicon sealers ― Fuel contaminated by silicon additives ― Excessive oil consumption ― Glycol leaking internally in the engine ― Lead-contaminated fuel ― Short drive cycles in cold weather ― Use of unapproved cleaning agents • Is a concern present? | Yes | Repair or replace the source of the contamination. Replace the engine oil and oil filter. Go to the next step.
No | Go to the next step. (The system is operating normally at this time. The concern may have been caused by a loose or corroded connector.).
5 | VERIFY TROUBLESHOOTING OF DTC P2097:00, P2099:00 HAVE BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the OBD DRIVE MODE up to Misfire, Fuel and HO2S Monitors (Step 11). (See OBD DRIVE MODE [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.