1. Check the Throttle Position Sensor (TPS):
* Visual Inspection: Start with a visual inspection of the TPS. Look for any signs of physical damage, loose connections, or corrosion on the sensor or its connector. The TPS is usually mounted on the throttle body, a butterfly valve located near the engine's intake manifold. It's a small sensor with a connector.
* Clean the Throttle Body: A dirty throttle body can interfere with the TPS's operation. Use a throttle body cleaner (following the instructions carefully) to clean the throttle body and ensure the throttle plate moves freely. Let it dry completely before proceeding.
* Ohm Test (Advanced): This requires a multimeter. The TPS has a variable resistance that changes with throttle position. Your car's repair manual will provide the specific resistance values for the TPS at different throttle positions (idle, wide open). If the resistance readings are outside the specified range, the TPS is likely faulty and needs replacement.
2. Check the TPS Wiring and Connector:
* Inspect Wiring: Carefully examine the wiring harness leading to the TPS for any signs of damage, fraying, shorts, or corrosion. Repair or replace damaged wiring as needed.
* Connector Inspection: Check the connector at the TPS for corrosion or loose connections. Clean the connector contacts with electrical contact cleaner and ensure a secure connection.
3. Replace the Throttle Position Sensor (TPS):
* If the visual inspection, cleaning, and ohm test (if performed) point to a faulty TPS, replacement is the next step.
* Obtain a replacement TPS: Ensure you get a TPS specifically designed for your 1998 Chrysler Concorde engine. Using an incorrect part will likely lead to further issues. Auto parts stores can help identify the correct part based on your VIN or engine details.
* Installation: Consult a repair manual or online video tutorials for specific instructions on replacing the TPS. Generally, it involves disconnecting the connector, removing the screws holding the sensor in place, and installing the new sensor. Ensure the new sensor is properly seated and the connector is securely connected.
4. Clear the Code:
After making any repairs, use an OBD-II scanner to clear the trouble code from the ECM's memory. Then, run the engine and monitor for the code's return. If the code returns, you may have missed something in the troubleshooting steps.
Important Considerations:
* Repair Manual: A repair manual specific to your 1998 Chrysler Concorde is invaluable for detailed diagrams, specifications, and instructions.
* Safety: Disconnect the negative battery terminal before working on any electrical components.
* Professional Help: If you're not comfortable performing these repairs yourself, take your vehicle to a qualified mechanic.
Ignoring a P0122 code can lead to drivability problems, poor fuel economy, and even engine damage in extreme cases. Address the issue promptly to prevent further complications.
