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Test Description

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3. 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 J 35314-A. Removing the HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. 4. This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 7. Confirming that the condition has been fixed is essential. If the symptom still exists, proceed to Step 2 and repeat the diagnostic procedure.
  4. 8. Confirming that the condition has been fixed is essential. If the symptom still exists, proceed to Step 2 and repeat the diagnostic procedure.
Fig 1: Restricted Exhaust, Testing Procedures (1 of 2)
G01766041Courtesy of GENERAL MOTORS CORP.
Fig 2: Restricted Exhaust, Testing Procedures (2 of 2)
G01766042Courtesy of GENERAL MOTORS CORP.
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