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.
Diagnostic Aids
2004 Oldsmobile Bravada RWDSECTION Diagnostic Aids
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.
Inspect for the following conditions:
- An EGR valve that shows signs of excessive heat. Check exhaust system for blockage, or for a plugged catalytic converter.
- Vacuum restriction to MAP sensor. A restriction to MAP sensor can cause EGR flow test to fail due to insufficient MAP changes being monitored during the test.
- An engine that is running poorly may cause this DTC to set.
- A poor connection or damaged harness. Inspect wiring harness for damage.
- If harness appears to be okay, observe EGR position sensor display on scan tool while moving connectors and wiring harnesses related to EGR valve. A change in display indicates location of malfunction.
To verify a repair, clear info with the scan tool and run the EGR flow test keeping the following items in mind:
- PCM will only run EGR flow test during a gradual deceleration.
- PCM will only run EGR test during a closed throttle condition.
- PCM will only run EGR test at vehicle speeds more than 28 MPH.
- As many as 9-12 deceleration cycles will be necessary to run a sufficient number of EGR flow test samples.
- EGR Test Counter displayed on scan tool can be useful in determining that EGR flow test is running and to keep track of number of test samples taken. Counter will increment each time a test sample is taken.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.