Test Description

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 pressure is noticed on the exhaust back pressure gauge. Removing the HO2S sensor may set a DTC. When finishing this diagnostic procedure, ensure to clear all codes.
2. 5  - This step will isolate the catalytic converter from the remainder of the exhaust system.