← Back to list

2007 Chrysler Crossfire P2098 Emissions Failure: Oxygen Sensor Replacement and Diagnostic Solutions

Model: 2007 Chrysler Crossfire Fault Code: P2098 Posted: 2015-05-25 16:35

My 2007 Chrysler Crossfire coupe convertible is failing emissions tests due to a persistent P2098 fault code, along with a previous P0410 code. The dealership initially recommended replacing the oxygen sensor and main engine relay (part number 5099007AA) to resolve the issue. I replaced all four oxygen sensors myself—choosing Bosch brand parts—because aftermarket sensors often don’t meet OEM specifications, and I found it significantly cheaper than paying the dealer for a single sensor. After completing the replacement and cleaning the MAF sensor, I reset the system using an OBD2 scanner. The check engine light turned off temporarily, but after driving approximately 50 miles, both P2098 and the check engine light returned. I use Shell High 93 octane fuel, which is standard for my vehicle. I’ve already addressed the P0410 code by replacing both downstream oxygen sensors (and a second-year upstream sensor), but the P2098 persists. I’m seeking expert advice on how to properly diagnose and resolve this issue—especially since the fault appears to be related to fuel trim behavior or sensor accuracy. Key questions: - Is high-octane fuel necessary for a 3.2L Crossfire engine? - How should P2098 be diagnosed using live data from an OBD2 scanner? - Are there known exhaust, intake, or vacuum system leaks that could trigger this code? - Could the issue stem from non-OEM sensors or incomplete adaptive learning after repairs?

Related fault codes

P2098

Comments (4)

Anonymous 2015-05-26 08:03

The 3.2L engine in a 2007 Crossfire does not require high-octane fuel—using premium gas is unnecessary and costly. Many aftermarket oxygen sensors fail to meet OEM specifications, which explains why they are priced low. To properly diagnose P2098, you must first confirm whether the code is triggered by actual sensor readings or a misinterpretation of feedback. Could you clarify how you performed the 'reset' of your OBD2 scanner? Was it a simple system reset, or did you clear adaptive values? Have you resolved the P0410 issue? Do you have access to an OBD2 scanner that shows live data (e.g., fuel trims, lambda readings)? Is your vehicle stock configuration with no modifications? Are there any known exhaust or intake leaks?

Anonymous 2015-06-04 17:05

Thanks for the response. I’ve successfully fixed the P0410 code by replacing both downstream oxygen sensors and upgrading the upstream sensor (though it’s two years old). All four sensors are Bosch OEM parts. After cleaning the MAF sensor and resetting the system, the check engine light went off—but returned after about 50 miles of driving. I’m still unable to find a permanent fix for P2098. The issue seems to reappear even after full resets. I suspect it may be related to adaptive learning or faulty sensor feedback. Any guidance on how to properly clear adaptives and verify fuel trim behavior would be greatly appreciated.

Anonymous 2015-06-04 19:04

P2098 (Bank 2 Sensor 2) indicates that the oxygen sensor reading is not fluctuating as expected—this is a key diagnostic sign. The Powertrain Control Module (PCM) attempts to maintain a lean condition by adjusting fuel trim, but if it fails to detect proper feedback, it sets this code. To properly diagnose: - Use an OBD2 scanner to monitor live data and observe the actual oxygen sensor signal over time. - Check whether the fuel trims are stable or drifting—especially Bank 1 and Bank 2 short-term and long-term values. - Confirm that all adaptive learning cycles were fully cleared before retesting. Possible root causes: - Non-OEM oxygen sensors not meeting calibration specs - Intake or exhaust leaks (after MAF cleaning) - Vacuum system leaks - Fuel contamination or injector issues Mechanical checks to consider: - Air induction system integrity - Engine vacuum levels (must be at least 13 inches Hg in neutral) - Valve timing and compression specifications - Exhaust system for leaks or restrictions - PCV system flow - Torque converter stall speed - Fuel quality and injector health If all these are within spec, the issue may point to a deeper engine or sensor malfunction.

Anonymous 2018-12-07 14:25

I’ve attached frozen data from my Chrysler 300 S (same platform as Crossfire) for reference. The P2098 code persists even after replacing the O2 sensors. Below is a sample of the freeze frame log generated by Torque for Android: ECU Freeze Frame Log Ali Saoud to me 1 hour ago Details Freeze frame report generated by Torque for Android ========================================================= Vehicle VIN: 2C3CCABG5CH263190 Vehicle Manufacturer: Chrysler Vehicle Calibration ID: 68138430AH Freeze frame information: ------------------ Fuel Status = 0 byte Engine Load = 96.078 % Engine Coolant Temperature = 94 °C Fuel Trim Bank 1 Short Term = -4.688 % Fuel Trim Bank 1 Long Term = 2.344 % Fuel Trim Bank 2 Short Term = -4.688 % Fuel Trim Bank 2 Long Term = 2.344 % Intake Manifold Pressure = 13.198 psi Engine RPM = 1,214 rpm Speed (OBD) = 92 km/h Timing Advance = 12 ° Intake Air Temperature = 21 °C Throttle Position(Manifold) = 24.706 % Run time since engine start = 489 s Fuel Level (From Engine ECU) = 40.784 % Evap System Vapour Pressure = -885 Pa Barometric pressure (from vehicle) = 13.924 psi Voltage (Control Module) = 14.546 V Engine Load(Absolute) = 63.137 % Commanded Equivalence Ratio(lambda) = 1 Relative Throttle Position = 14.51 % Ambient air temp = 15 °C Absolute Throttle Position B = 24.706 % Accelerator PedalPosition D = 30.588 % Accelerator PedalPosition E = 15.294 % End of report. The fuel trims are symmetric across both banks and show a consistent negative short-term value, suggesting the system is running rich or misreading feedback. This may indicate that the PCM is unable to adjust properly due to sensor inaccuracies or underlying mechanical issues. I’m looking for expert insight on how to interpret this data in context of P2098.