Question about 2001 Jaguar S-Type

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Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2

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P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.

Posted on May 21, 2011

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Posted on Jan 02, 2017

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SOURCE: check engine light on

Check out this site as it tells you exactly the problem http://www.obd-codes.com/p0171
Hope this helps

Posted on Jan 15, 2009

  • 1129 Answers

SOURCE: codes P0171, P0174, P0440

This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.

Posted on Dec 29, 2009

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P0171 ; Fuel Trim System Lean (Bank 1)
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