P0171 ISUZU -

Question

2002 isuzu engine code PO171

Answer 1

This code refers to a lean condition on bank 1. The most common cause would be some type of vacuum leak on bank 1. With the engine running, take some carb cleaner and spray it around any vacuum lines and the intake manifold. If the idle speed increases or smooths out, then you have a leak. Locate the source of the leak and repair to resolve the issue.