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 is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Meet the conditions for engine warm-up. Use the scan tool catalyst data list in order to verify the following conditions:
- DTCs P0030, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0201-P0206, P0300, P0336, P0341, P0404, P0405, P0410, P0440, P0442, P0443, P0502, P0503, P0506, P0507, P1133, P1134, P1351, P1352, P1361, P1362, or P1441 not set.
- Engine has been running longer than 10 minutes.
- Engine Coolant Temperature (ECT) is 169-255°F (76-124°C).
- Barometric (BARO) pressure is above 75 kPa.
- Vehicle is in Closed Loop.
- Intake Air Temperature (IAT) is -4 to 212°F (-20 to 100°C).
- Battery voltage greater than 10.7 volts.
- Warm up the catalyst.
- Fully open the hood.
- Transmission in Park (A/T) or Neutral (M/T).
- Set parking brake.
- Press and hold the service brake.
- Each time the engine is started the diagnostic can run up to 18 times. After the 10-minute run time, and before the diagnostic runs the first time, the engine must run an additional 5 minutes between 1500-2500 RPM. For any additional tests on the same key cycle, the engine must be between 1500-2500 RPM for one minute.
- In order to activate the diagnostic, return the engine to idle and place transaxle in Drive (A/T) or depress clutch pedal (M/T).
- Test the catalyst.
- The transaxle is in Drive (A/T) or Neutral (M/T) with the clutch pedal depressed.
- Within 60 seconds the air/fuel ratio will go lean, less than 14.1, for up to 7 seconds. The air/fuel ratio may then go rich, greater than 15.3, for up to 7 seconds.
- Using scan tool, check and see 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.