P2198 on a 05 Lincoln LS 3.0 V6 Bad Fuel mileage & run ruff at start up

Question

P2198; Lincoln LS 0 V6, Bad Fuel 18mpg & run rough at start up No vacuum leak

Answer 1

Hi there 

These codes are for both front O2 sensors stuck in biased/rich. This means the sensors are seeing a rich fuel mixture. Since the issue is on both banks, I would check the spark plug conditions and also look for a possible issue with the mass air flow sensor. Here is a list of other possible causes.

P2198 LINCOLN - Oxygen Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1

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