Emissions failure 99 jeep cherokee 4.0

Asked by GuruN27LN Nov 07, 2019 at 11:51 AM about the 1999 Jeep Cherokee

Question type: Maintenance & Repair

Vehicle failed for lean condition and also a rick condition at
different load conditions on a dyno style e-test. Keeps
setting a lean fuel code. P0171

1 Answer
41,240

TDolby answered 5 years ago

A p0171 indicates a lean condition, and a possible vacuum leak. Perform a smoke test if you can't find which hose or gasket is allowing unmetered air to escape.

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