just in case that doesn't work for someone. Those two codes have turned a lot of my hairs grey! Where did you find that procedure? Here is something I posted in another forum a while back. Reading sae code P2173 was determined that code and subsequent limp mode was designed to prevent damage to the plastic intake manifold. During repair, pressure tested intake for leaks, and tubes and lines for cracks. The intake manifold (newer design for the 2.0L I4 without the flapper controls just guide veins for the intake air) main gasket had shrunk in the plastic intake seat channel and was allowing outside air (P0171) to seep past the gasket on the lower lip of the gasket, and was also not sealing between the cylinders (gases were transferring between the cylinders). The rapid snapping of the throttle body under pressure uncalibrated the internal throttle position sensors, and could not maintain proper position was replaced. The map sensor set the P2173 code, then failed due to oil intrusion and was replaced. the PCV valve (multiaire) had failed at the internal pintle, and was allowing crankcase air/oil to enter the intake at too high a volume. Here are the basics for reference of what was found. I am mechanically competent due to training and experience and know my own limits of competency and tools for repair. Since the P0171 was a repeat code, and the P2173 was an unfamiliar sae code not normally used on my previous vehicles, a complete disassembly of the intake was warranted. Both codes were researched to determine best repair methods. We were on a schedule, so vehicle was shut off immediately and we used our other vehicle for Transport. On March 4, while vehicle was in warm-up phase at home, in idle, a sharp snap was heard (later discovered was the electronic throttle body), then vehicle set two codes (P0171, P2173), and immediately went into limp mode (traction control off, throttle body reduced power, ABS for slowing vehicle if being driven above slower speeds for limp mode). The manufacturer was not made aware of the failure. (900 I-45, ennis, tx 75119 phone: (877) 890-8768) who inform the contact to reach out to their insurance company. The contact did call local dealer ennis Ford, Inc. The vehicle was not inspected, diagnosed or repaired. The vehicle was not towed but left at the scene. There was no warning light illuminated from the vehicle. The fire department did arrive to the scene and extinguished the fire. The contact stated a person came with a fire extinguisher to try to put out the fire but was not successful. The contact exit out of the vehicle and notice fire coming from underneath the front hood. The contact stated they started seeing smoke coming thru the vent inside of the vehicle. The contact was able to pull over and stop the vehicle and began to smell burning wires inside of the vehicle. The contact stated while driving at 35 mph, the vehicle begin to shudder back and forth.
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