Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHRYSLER2004CROSSFIRE STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - ELECTRICAL DIAGNOSTICSDIAGNOSIS AND TESTINGDTC P0173: FUEL SYSTEM 2/1 RICH CONTROL OVER LIMIT (AT LOAD)DIAGNOSTIC TEST10. O2 SENSOR GROUND CIRCUIT
2004 Chrysler Crossfire Standard
10. O2 Sensor Ground Circuit
2004 Chrysler Crossfire StandardSECTION 10. O2 Sensor Ground Circuit
With the ignition on.
Measure the voltage on the O2 Sensor Ground circuit in the O2 Sensor harness connector.
Is the voltage below 0.1 volt?
- Yes >> Check the fuel system for contaminates. Also, check the exhaust system for any leaks. See EXHAUST SYSTEM article.
- No >> Check the O2 Ground circuit for a short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module. See ELECTRONIC CONTROL MODULES article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.