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.
Conditions For Running DTC
2004 Oldsmobile Bravada RWDSECTION Conditions For Running DTC
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Meet conditions for engine warm up. Using scan tool in catalyst data list, verify the following:
- Engine has been running more than 10 minutes.
- Engine Coolant Temperature (ECT) is 158-255°F (70-124°C).
- Barometer (BARO) is more than 75 kPa.
- Vehicle is in closed loop.
- Intake Air Temperature (IAT) is more than -4-212°F (-20-100°C).
- Battery voltage is more than 10.7 volts.
- DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0201-P0206, P0300, P0336, P0341, P0401, P0403, P0404, P0405, P0410, P0412, P0418, P0440, P0442, P0443, P0446, P0449, P0502, P0503, P0506, P0507, P1133, P1134, P1336, P1351, P1352, P1361, P1374, or P1441 are not set.
- Warm up catalyst.
- Fully open the hood.
- Set transmission is in Park (A/T) or in Neutral (M/T).
- Set parking brake.
- Press and hold service brake.
- Each time engine is started, diagnostic can run up to 18 times. After 10-minute run time and before diagnostic runs first time, engine must run an additional 5 minutes between 1500-2500 RPM. Any additional tests on same key cycle, engine speed must be 1500-2500 RPM for one minute.
- To activate diagnostic, return engine to idle and put vehicle in drive, or depress clutch for a manual transmission.
- Test catalyst.
- Transmission in Drive (A/T) or in Neutral (M/T with clutch depressed).
- With VIN K California emissions, within 60 seconds, air/fuel ratio will go rich less than 14.1 for up to 6 seconds. Then air/fuel ratio may go lean more than 15.3 for up to 8 seconds.
- With VIN K FED emissions, within 60 seconds, air/fuel ratio will go lean more than 15.3 for up to 6 seconds, then may go rich less than 14.1 for up to 7 seconds.
- With VIN 1, within 60 seconds, air/fuel ratio will go rich less than 14.1 for up to 7 seconds. Then air/fuel ratio may go lean more than 15.3 for up to 9 seconds.
- Using scan tool, check if DTC P0420 has passed or failed this key cycle.
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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.