Question about 2004 Ford F150
-truck runs fine when the issue doesn't occur -trucks has issues accelerating when it does -recently changed a few ignition coils -this issue is on and off -doesn't seem to happen at low speeds -no other codes come on
Code 171 means the O2 sensor is telling the computer the fuel mixture for bank one is too lean. Bank one is the side with cylinder number one. The problem could be the sensor, or something else like an injector that is actually causing the fuel mixture to be lean. The sensor would need to be checked.
Posted on Jul 11, 2013
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Posted on Jan 02, 2017
SOURCE: Trouble code P2135, and P2106.
I have the same problem on my 06 explorer.
Ford Dealership told me i needed my "electronic throttle body assembly" replaced.
It would cost about $630.
I'm a little hesitant to let them do that service though, because it may not be the whole thing that needs replacing. I'd just look in to getting the Throttle Positioning Sensor replaced.. which would cost a lot less.
Posted on May 24, 2009
if the engine light is flashing, it means you have a misfire in one or more cylinders. it is most likely plugs or coil wires.
mine started doing this a few weeks ago. finally got around to changing the plugs today. the cylinder order on fords is easy, passenger side from front to back is 1234, driver side front to back is 5678. my number 4 cylinder had a plug that was collapsed. the metal piece was crushed into the contact, not allowing any spark.
Posted on Jul 13, 2009
Code definition is Electronic Pressure Control (EPC) Solenoid. This solenoid is located in the trans pan. Driving the explorer without getting it fixed could also wear down other parts in your transmission!
Posted on Jul 29, 2009
4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.
Posted on Jul 08, 2011
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System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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