EcoBoost put twin turbos in America's best-selling truck, and those turbos are now aging out of warranty by the millions. Boost Lab, Inc. rebuilds the BorgWarner units on the 3.5L twin-turbo V6 in the F-150, Raptor, Expedition and Navigator, the 2.7L Nano V6, and the 2.0L and 2.3L four-cylinders in the Mustang, Focus ST, Focus RS, Explorer and Escape. Rebuild the unit you have instead of paying dealer prices for an assembly. Nationwide ship-in service.
One badge, many very different turbo systems. Know which one you have before ordering anything.
Twin BorgWarner K03-family turbos, one per bank. Gen 1 trucks are the highest-mileage EcoBoosts on the road and the ones we see most. Critical fitment note: 2011 to 2012 turbos carry a turbo-mounted blow-off valve and 2013 to 2016 units do not; they are not interchangeable. We rebuild singles or matched pairs.
Second-generation 3.5L with electronic wastegate actuators and up to 450 hp in Raptor and Limited HO trim. The HO Raptor turbos differ from standard-output units. Gen 2 trucks are notorious for coolant line fitting leaks at the turbos; plan on addressing lines during any turbo job.
The compact twin-turbo 2.7L is a strong workhorse, and its smaller turbos work hard in a hot valley. Failures follow the usual oil and heat patterns and cores rebuild well. Bronco 2.7L twins are the same family.
The 2.3L single turbo covers everything from EcoBoost Mustangs to the Focus RS to Explorer ST-adjacent applications and Ranger. Tuned cars accelerate wear substantially. Rebuildable across the family; tell us the vehicle and tune status when you submit.
The high-volume 2.0L single turbo appears across the lineup. By now most are well past 100,000 miles, and worn bearings showing up as P0299 underboost or oil consumption are routine. A rebuild costs a fraction of a dealer assembly.
The small-displacement EcoBoosts run small, fast-spinning turbos that are sensitive to oil quality and heat soak. Fiesta ST units in particular lead hard lives. All rebuildable, and often the only economical path given what small assemblies cost new.
Three traps on the 3.5L. First, 2011 to 2012 turbos have a compressor-housing blow-off valve mount and 2013 and later turbos do not; the systems are not interchangeable. Second, standard-output and High Output (Raptor, Limited) turbos are different units. Third, left and right bank turbos are side-specific. Always match the OEM number on your unit's tag, and when in doubt send photos through the repair form before shipping anything.
Verified BorgWarner and Garrett catalog numbers with Ford OEM numbers across the EcoBoost line. Left and right units on the V6 twins are side-specific. Search by any number.
| Turbo PN | Model | OEM PN | Application | Notes |
|---|---|---|---|---|
| 53039881004 (L) / 53039881005 (R) | BorgWarner K03 | BL3E-9G438-VA / UA | 2011-2012 F-150 3.5L Gen 1 early | Turbo-mounted BOV; NOT interchangeable with 2013+ |
| 53039880469 (L) / 53039880470 (R) | BorgWarner K03 | DL3Z-6K682-A/C/E, DL3E-6C879-AA to AF | 2013-2016 F-150 3.5L, 2015-2017 Expedition/Navigator | No BOV mount; reman set 53039900469/470 |
| 53039880644 (L) | BorgWarner K03 | HL3Z-6K682 family | 2017-2020 F-150 3.5L, 2018-2021 Expedition/Navigator | Gen 2; standard output and Raptor HO differ |
| Tag-specific by side | BorgWarner K03 | JL3Z-6K682-A/B/C/D, JL7E-6C879-BF | 2018-2023 F-150 / Expedition / Navigator 3.5L | Late Gen 2 service numbers, side-specific |
| 53039880406 (L) / 53039880407 (R) | BorgWarner BOCS | FL3Z-6K682-A/C/D (L), FL3Z-6K682-B/E (R) | 2015-2017 F-150 2.7L Nano | Castings FL3E-6C879-DE (L), FL3E-6K682-DB (R) |
| 53039880406 / 407 (later rev) | BorgWarner BOCS | JT4E-6K682-AB / AC | 2018-2019 F-150 2.7L Nano | Second-gen 2.7L service numbers |
| 821402-5010S / 821402-5014S | Garrett (twin-scroll) | FR3Z-6K682-C / D / E | 2015-2023 Mustang 2.3L EcoBoost | Ford Performance HP turbo M-9438-23T also fits |
| 53039700368 | BorgWarner K03 | CJ5E-6K682-BA / CA / CB / CC / CE / CF / CG | 2013-2018 Focus ST 2.0L EcoBoost | High-volume 2.0L unit; Escape/Fusion 2.0 similar family |
| 5439-970-0131 family (KP39) | BorgWarner KP39 | CJ5G-6K682-AA / BA / CA / DA / DB, CJ5Z-6K682-D / K / L | 2014-2019 Fiesta ST, 2013-2016 Escape, 2013-2014 Fusion 1.6L | Alt 5439-970-0121/0124/0125/0130/0133 |
| Tag-specific | Continental / BorgWarner | CM5G-6K682-GB / GD / GE, CM5Z-6K682-A / B / C / E / L | 2014+ Fiesta, Focus, EcoSport 1.0L EcoBoost | Three-cylinder city-car unit |
Patterns straight off the bench, by generation and engine.
The quick-connect fittings on the turbo coolant hard lines degrade and seep, especially on Gen 1 trucks. Lost coolant means hotter turbos and cooked bearings, and a slow leak can masquerade as a head gasket. Replace lines and fittings with the turbos, every time.
First-generation 3.5L exhaust manifolds warp under heat cycling, stretching and snapping studs. The resulting exhaust leak ticks on cold start and steals drive pressure from the turbine. If your truck ticks, inspect manifolds before condemning the turbos, and fix both together.
Hard towing followed by immediate shutdown bakes oil in the center section. Extended factory oil intervals make it worse. Coked passages starve the bearings on the next cold start. We see it on every EcoBoost variant, worst on trucks that tow.
Wastegate linkage wear causes the famous EcoBoost rattle, and failed electronic actuators on Gen 2 cause underboost or overboost codes without any cartridge damage. We evaluate actuators and linkage on every rebuild; sometimes the fix is cheaper than owners fear.
Beyond 100,000 miles, journal bearing wear opens wheel clearances and boost falls off. P0299 sets. Rule out boost leaks, charge pipe clamps, and the intercooler first; if shaft play is measurable, the cartridge is the cause.
Tuned Mustangs, Focus STs and RSs push small turbos far past their design point. Overspeed shows up as compressor wheel bore stretch and blade tip damage. Rebuildable, and worth an honest conversation about whether the stock frame matches your power target.
Not always, but the twin that did not fail has lived the same life as the one that did. If one side failed from age-related bearing wear, budgeting for both, or at least having us inspect the second unit while the truck is apart, avoids doing the labor twice.
No. The 2011 to 2012 turbos have a blow-off valve mounted on the compressor housing; 2013 and later trucks moved to a single BOV on the intercooler and the turbos have no mount. Match your OEM part number.
No. P0299 means underboost, and boost leaks, charge pipe clamps, intercooler issues, and wastegate actuator faults all cause it. Check the cheap causes first. If the shaft has measurable play or the wheels contact the housings, then it is the turbo.
Yes. The HO units on Raptor and Limited are different from standard-output 3.5L turbos but rebuild the same way. Note the truck trim in your submission so we match the correct specifications.
On the 3.5L, yes. The line fittings are a known leak point and turbo labor overlaps line labor almost completely. Fresh lines protect the rebuilt turbos from running hot.
Start at repair.theboostlab.com, then send the unit or pair to Boost Lab, Inc., 37833 Pineapple Ave, Unit A, Dade City, FL 33523. Label left and right units if shipping a pair. We serve EcoBoost owners nationwide.