Fix codes P0172, DTC P0172, Ford Focus 2.3 engine, P0172 – System too Rich (Bank 1)
Ford has issued a technical service bulletin (TSB) 05-10-22 to address DTC P0172, P0172 – System too Rich (Bank 1). The bulletin applies to 2003-04 Ford Focus vehicles with the 2.3L PZEV engine and 4F27E transmission. The check engine light will be lit, but you may not notice and drivability symptoms. Do NOT start replacing parts. Ford has issued new software to correct the problem. Take the vehicle to a Ford dealer or an independent shop that has reprogramming capabilities. Refer them to TSB 05-10-22.
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