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2002 Mercury Cougar 2.5L with DTC codes P0340 and P0171, what is the meaning?

Vehicle: 2002 Mercury Cougar 2.5L

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by (12.6k points)
Hi there

The first code P0340 is a code for the bank 1 cam position sensor. Most of the time the sensor itself is the cause of this code, however, if the timing is off you will also get this code.

The second code, P0171 is for a lean fuel mixture on bank 1. This code can appear when the timing is off and also be caused by the front O2 sensor on that bank.
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P0171 MERCURY - Fuel Injection System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_mercury.html

P0340 MERCURY - Camshaft Position Sensor Circuit Bank 1 Sensor 1
Read more: https://www.autocodes.com/p0340_mercury.html

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