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 MANUALSCHEVROLET1998CAMARO SS, 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - TESTS W/CODES - 5.7LDIAGNOSTIC TROUBLE CODESDTC P0155 - HO2S HEATER CIRCUIT BANK 2, SENSOR NO. 1DIAGNOSTIC PROCEDURES
1998 Chevrolet Camaro SS, 2D Coupe, Standard
Diagnostic Procedures
1998 Chevrolet Camaro SS, 2D Coupe, StandardSECTION Diagnostic Procedures
- Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.NOTE: If engine has been operating, allow engine to cool for about one hour before proceeding with tests.
- Turn ignition off. Turn ignition, with engine off. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage goes from bias voltage to greater than 700 mV or less than 300 mV, see DIAGNOSTIC AIDS. If HO2S voltage remains within 300-700 mV range, go to next step.
- Check HO2S ignition feed fuse. If fuse is faulty, go to step 11). If fuse is okay, go to next step.
- Raise and support vehicle. Disconnect HO2S harness connector. Connect test light to chassis ground and probe ignition feed circuit at HO2S harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
- Connect test light between ignition feed and heater ground at HO2S harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
- Using DVOM, check resistance between ignition feed and heater ground at HO2S harness connector. If resistance is 3.5-14.0 ohms, go to step 9). If resistance is not 3.5-14.0 ohms, go to step 10).
- Repair open in HO2S ignition feed circuit. After repairs, go to step 12).
- Repair open in HO2S heater ground circuit. After repairs, go to step 12).
- Check for poor terminal connection at HO2S connector. Repair or replace terminals. After repairs, go to step 12).
- Replace HO2S. After replacing HO2S, go to step 12).
- Locate and repair short to ground in HO2S ignition feed circuit and replace fuse. After repairs, go to next step.
- Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0155. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.