Remanufactured 4F27E / FN4A-EL valve body with harness for 2000-2011 Ford Focus and Mazda 2, 5 and 6; cures flare, harsh shifts and pressure codes.
A 2000-2011 Ford Focus or a Mazda 2, 5 or 6 with the four-speed automatic that flares on the 2-3 shift, slams into Drive or Reverse, or drops hard on the 3-2 downshift is a textbook 4F27E valve body case. Add intermittent solenoid codes that come and go with temperature or bumps, and the internal wiring harness is usually part of the story too. This remanufactured valve body ships with the internal harness, so both common failure points on this transaxle are replaced in one job.
The 4F27E, built by Ford and badged FN4A-EL in Mazda cars, controls every shift hydraulically through the valve body mounted on the side of the case. The powertrain module sends current through the internal harness to the shift solenoids, the line pressure solenoid and the converter clutch solenoid. Those solenoids set signal pressures that move the valves in the body, which then apply the band and clutches for each gear. Two things go wrong with age. The aluminum bores wear around the busiest valves, so pressure bleeds off and shifts go soft or harsh. And the harness, which lives in hot fluid and is routed close to moving parts, can chafe or crack its insulation, causing open or shorted solenoid circuits that set codes even when the solenoid is fine.
Check the fluid level and condition first. Then measure each solenoid circuit at the case connector, and wiggle the connector while watching the reading; a jump or open circuit while moving it points to the harness rather than the valve body. Our guide on testing a solenoid with a multimeter covers the procedure. If the circuits are clean and shift quality is still poor, a pressure test will show whether line pressure is low or unstable, and our pressure testing guide explains how to read it. Ratio codes that appear with these symptoms are covered in what P0730 actually measures.
Listed applications are the 2000-2011 Ford Focus with the 1.6L, 1.8L, 2.0L or 2.3L engine, the 2008-2011 Ford Festiva, the 2007-2011 Mazda 2 with the 1.3L or 1.5L, the 2005-2011 Mazda 5 2.0L and the 2002-2008 Mazda 6 2.0L or 2.3L. That is a long run, and the valve body and harness changed along the way. Before you install, compare your old casting, check-ball locations and the case connector shape against this unit. If your vehicle is not on the list, or you want a second check, send us your year and VIN. Other versions, including new valve bodies for the Mazda 2 and Mazda 5, are in our 4F27E parts collection.
This is a reman unit. The outside of the casting may show surface wear or staining from previous service, but the bores and valves are rebuilt and checked before it ships. What matters for shift quality is the inside, and that is the part that has been restored.
Drain the fluid, remove the side cover and unplug the case connector. Before lifting the old body out, note how the manual valve links to the shift lever and where each check ball sits. Install the new harness, set the valve body in place, connect the manual valve, and torque the bolts evenly in a cross pattern. Use a new cover gasket and refill with Mercon V. Change the filter with the FN4A-EL filter and pan gasket kit so debris from the old body is not carried into the new one, and use fresh fluid such as Motorcraft Mercon V ATF. Clear codes and run a relearn so the module resets its shift adapts; our adaptive relearn guide covers the drive cycle. If the band or clutches already slipped long enough to burn, pair this with a 4F27E master rebuild kit.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. The internal wiring harness ships with the valve body, so a chafed or cracked harness is replaced at the same time.
The listing covers the remanufactured valve body and the internal harness. Check your original solenoids for resistance and condition; if they are worn, replace them during the install.
The 2000-2011 Focus is on the listed fitment. Compare the casting and connector against your original, or send us your VIN and we will confirm.
It is a remanufactured core. Surface wear on the outside is normal; the bores and valves are rebuilt and checked before shipping.
Use Mercon V. Refill after install and check the level hot at idle, since a valve body swap only drains part of the total capacity.
