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 MANUALSJAGUAR2002XK8 2D COUPEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TROUBLE CODE IDENTIFICATIONDTC P0161:HO2S HEATER CIRCUIT MALFUNCTION (BANK 2, DOWNSTREAM 2)DIAGNOSTIC TEST PROCEDURE
2002 Jaguar XK8 2D Coupe
Diagnostic Test Procedure
2002 Jaguar XK8 2D CoupeSECTION Diagnostic Test Procedure
- Turn ignition off. Disconnect HO2S harness connector. Turn ignition on. Make sure the O2S heater relay is energized and measure the voltage between HO2S harness connector terminal No. 2 and ground. Is voltage greater than 10 volts? If yes, go to next step. If no, repair the power supply circuit to the HO2S heater. This circuit includes the O2S heater relay, the EMS control relay, of the EMS fuse box (fuse No. 1) and the high power protection module.
- Disconnect negative battery cable. Disconnect the ECM connector EM84. Measure resistance between ECM harness connector EM84, terminal No. 7 and HO2S harness connector terminal No. 1. Is resistance greater than 5 ohms? If yes, repair wiring as necessary. If no, replace HO2S. See HEATED OXYGEN SENSOR (HO2S) under ENGINE SENORS in REMOVAL, OVERHAUL & INSTALLATION article. If DTC resets, possible ECM failure.
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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.