Test Description - Malibu

The numbers below refer to the step numbers in the diagnostic procedure.

1. 4  - The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust backpressure is noticed on the exhaust backpressure gauge.
2. 5  - This step will isolate the catalytic converter from the remainder of the exhaust system.
3. 8  - Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to step  2 and repeat diagnostic procedure on the opposite exhaust pipe.