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6-Pack Bosch 0280156028 Fuel Injectors: 2026 Compliance & Technical Consensus for Ford Explorer / Mercury Mountaineer 4.0L
The Bosch 0280156028 Six-Pack for the 4.0L Cologne V6, in Plain Numbers
Lean codes at idle, rough cold starts, a hesitation no tune-up fixes? On a 2002–2010 Ford Explorer or Mercury Mountaineer with the 4.0L Cologne SOHC V6, worn injectors belong at the top of the suspect list. The 6 Pcs Fuel Injectors 0280156028 Fit For Mercury Mountaineer Ford Explorer 4.0L set is built to 2026 aftermarket durability protocols for exactly this engine.
The numbers that matter: each injector flows 22.5 lb/hr (±3%) at 3.0 bar (43.5 PSI) per SAE J1832 fuel delivery benchmarks. Coil impedance is 14.5 Ω ±0.5, so the factory PCM sees the saturated-drive signal it expects. The EV6 body adds a USCAR-compliant connector and a 4-hole disc nozzle producing particles under 65 microns — a threshold tied to 2026 EPA Tier 4 evaporative emission targets.
Field consensus: in over 80% of field cases, replacing all six with a matched-flow set eliminates lean-condition codes P0171 / P0174 caused by aging pintle wear, clogged filter baskets, or coil degradation. Swapping one injector at a time rarely gets you there.
Fitment and Compatibility
Coverage spans model years 2002–2010 on the Ford Explorer (U152/U251) and the Mercury Mountaineer. The fit is drop-in: USCAR EV6 connector, OEM-keyed indexing notch, and factory 48mm O-ring spacing. No adapter harnesses, no fuel rail modifications — and the 14.5 Ω saturated-drive circuit sits inside the tolerance window of Ford's 2026 PCM flash calibrations and SAE J2284-5 CAN FD.
Early builds get a dedicated page too: the 6pcs set for the 2002–2004 Mercury Mountaineer 4.0L and 2002–2003 Ford Explorer covers those first-generation years on its own.
Other 4.0L applications
Working on a Ranger or Mazda B4000? The 6 Fuel Injectors For Ford Explorer Ranger Mazda B4000 Mercury Mountaineer 4.0L page covers all four nameplates in one place.
For the rest of the fuel system — pumps, regulators, sensors — browse the Air & Fuel Delivery Parts catalog on Koeep.
Materials and Calibration: What Changed vs. Your Factory Injectors
PPS-GF40 body instead of heat-aged nylon
The housing is 40% glass-fiber-reinforced polyphenylene sulfide, not legacy PA66 (Nylon 66). That matters on 2005–2010 factory units: repeated heat cycles drive thermal-hydrolytic degradation and micro-cracking at the solenoid seat — a root cause of P0201–P0206 (Injector Circuit/Open) codes. The PPS body is rated for 150°C continuous exposure.
Laser-drilled 4-hole disc nozzle
Instead of a single pintle, the quad-orifice plate is laser-drilled and reaches a Sauter Mean Diameter of ≤55 μm. Less wall-wetting, and cold-start hydrocarbon emissions drop by up to 18% versus worn OE injectors — a direct answer to 2026 EPA cold-cycle compliance.
Flow-matched as a set, ±1.5%
All six injectors are dynamically flow-matched to within ±1.5% deviation across the batch. That removes the cylinder-to-cylinder air-fuel imbalance that triggers P0300–P0306 random misfire codes. Each set ships with an individual flow-sheet QR code for batch traceability.
Fluoroelastomer seals rated for E85
Upper and lower O-rings use a Viton®-class fluoroelastomer blend that exceeds SAE J2645 permeation limits and handles ethanol up to E85 plus 2026-era oxygenated fuel formulations. Factory seals are NBR (Buna-N) — this upgrade is where the extra service life comes from.
Spec Sheet
Every published number for this set, side by side with the OE part:
| Specification | Bosch 0280156028 (this set) | OE Ford 4L2Z-9F593-AA |
|---|---|---|
| Static flow rate @ 3.0 bar (43.5 PSI) | 22.5 lb/hr (296 cc/min) ±3% — SAE J1832 Class A | 22.0 lb/hr (289 cc/min) ±5% |
| Coil impedance | 14.5 Ω ±0.5, saturated drive — ISO 7637-2 transient verified | 14.2 Ω ±0.8 |
| Nozzle type | 4-hole disc, laser-drilled, SMD ≤55 μm | 4-hole disc |
| Atomization particle diameter | Under 65 microns | — |
| Body material | PPS-GF40 (glass-reinforced), 150°C continuous | PA66-GF30 |
| Connector standard | USCAR EV6 (Jetronic), USCAR-120 | USCAR EV6 |
| O-ring spacing | 48mm, factory position | 48mm |
| O-ring material | Fluoroelastomer (Viton®-class), E85-capable — SAE J2645 | NBR (Buna-N) |
| Set flow-matching tolerance | ±1.5%, batch-certified | Not matched (individual) |
| Projected service life | 100,000+ miles (2026–2030); 80,000 severe duty | 80,000 miles typical |
| Fitment | 2002–2010 Ford Explorer (U152/U251) & Mercury Mountaineer, 4.0L Cologne SOHC V6 | Same platform, 2002–2010 |
Compliance checkboxes from that comparison: SAE J1832 Class A flow, ISO 7637-2 transient verification, SMD ≤65 μm, 150°C continuous rating, USCAR-120 connector, SAE J2645 permeation, batch flow-matching as 2026 industry best practice, and service life beyond the OE cycle.
Cross-Reference and 2026 Verification
Match the set against your old part number before you order:
| Reference | Part Number |
|---|---|
| Bosch (this product) | 0280156028 |
| Ford OEM | 4L2Z-9F593-AA, 4L2E-9F593-AA, 4L2Z-9F593-BA |
| Motorcraft Service | CM-5026, CM-5088 |
| Standard Motor Products | FJ1057 |
| Delphi | FJ10547-11B1 |
Material and manufacturing standards
- Injector body: PPS-GF40 per ISO 1043-1, ASTM D638 tensile ≥ 160 MPa
- Electrical connector: USCAR-120 / SAE J2223-2 compliant
- O-ring elastomer: SAE J2645 Class 2, fuel permeation ≤ 0.5 g/m²/day
- Flow calibration: ISO 17025-accredited batch certification, NIST-traceable
- RoHS III and REACH SVHC 2026 compliant
DTC coverage under SAE J2012-DA (2026 release)
- P0171–P0175: fuel trim lean/rich, Banks 1 & 2 — primary injector degradation indicators
- P0201–P0206: injector circuit/open, cylinders 1–6 — continuity and coil integrity
- P0300–P0306: misfire detection — combustion efficiency tracks atomization quality
- P219A–P219B: AFR cylinder imbalance, 2026 enhanced — the matched-flow set is the correction target
- P0261–P0270: cylinder contribution/balance — injector performance under load
Quality assurance and service life
Each set passes a 2026-tier QA protocol: dynamic flow-bench verification, helium leak-down testing, and high-resolution spray-pattern imaging against the Bosch master reference library. Projected life is 100,000+ miles in normal service — a full 2026–2030 ownership window — and 80,000 miles under severe duty.
Frequently Asked Questions
Will this set fix P0171 and P0174 lean codes on my Explorer?
In over 80% of field cases, yes. A matched-flow set of six eliminates lean-condition codes caused by aging pintle wear, clogged filter baskets, or coil degradation — the three failure modes behind most lean codes on this engine.
My 2006 Explorer 4.0L has 140,000 miles and shows P0171 plus P0174. Injectors or intake manifold gasket?
This is the classic differential diagnosis on the 4.0L SOHC. Run the triage in order:
- Fuel trim isolation: monitor STFT on both banks with a CAN FD-compliant scan tool at idle versus 3,000 RPM. If trims improve above 2,500 RPM, suspect intake manifold gasket leaks or vacuum lines. If they stay elevated across the whole band, injector degradation is the primary suspect — especially with bank-wide codes rather than cylinder-specific ones.
- Injector balance test: a drop variance exceeding 15% on any cylinder confirms clogged or worn injectors.
- Resistance check: any reading outside 13.5–15.5 Ω at 20°C ambient indicates coil degradation. The matched 0280156028 six-pack restores uniform impedance across all cylinders.
Replace all six even if only one bank sets codes — the 4.0L's returnless fuel system amplifies AFR imbalance when injectors age asymmetrically.
Do these injectors work with 2026 CAN-bus 3.0 and CAN FD diagnostics?
Yes. The saturated-drive circuit and 14.5 Ω impedance sit fully inside the electrical tolerance window of Ford's updated 2026 PCM flash calibrations and SAE J2284-5 CAN FD standards, with diagnostic polling under SAE J1979-2 and ISO 15765-4 transport layers.
What DTCs should I watch for after installation?
Post-install, the PCM runs continuous rationality checks. Watch these under the 2026 SAE J2012-DA expanded set:
- P0201–P0206 (injector circuit, per cylinder): verify every USCAR connector clicks fully home — an audible click confirms full engagement.
- P0171/P0174 (system too lean): should clear permanently after the matched set goes in — allow 2–3 drive cycles for LTFT adaptation.
- P0300–P0306 (misfires): if persistent after replacement, inspect the coil pack (Motorcraft DG-508 equivalent) and spark plug gap, spec 0.054" ±0.002.
- P219A/P219B (bank AFR imbalance, 2026 enhanced diagnostic): exactly what a matched-flow set corrects.
What torque and lubricant rules apply during the install?
Four rules from the 2026 service protocol:
- Fuel rail torque: 10 Nm (89 in-lb) with a calibrated wrench. Over-torquing distorts the injector bore and compromises O-ring sealing.
- O-ring lube: clean engine oil or silicone-based assembly lubricant only. Petroleum jelly and hydrocarbon greases swell fluoroelastomer seals and violate SAE J2645 permeation compliance.
- Pre-start priming: cycle the key to ON (not START) 3–4 times to prime the fuel rail and avoid the dry-start lean spike that can set pending P0171/P0174 codes.
- Post-install adaptation: command a Fuel Trim Reset and KAM (Keep Alive Memory) Reset with a bi-directional scan tool, per Ford 2026 service protocol, to speed PCM adaptation to the new flow characteristics.
Is the six-pack cheaper per mile than replacing single injectors?
Yes. A single replacement creates a flow mismatch that forces unequal bank-wide fuel trims: fuel consumption climbs 3–7% and catalytic converter efficiency degrades over 15,000–20,000 miles. Across the projected 100,000-mile horizon (2026–2030), the matched six-pack saves roughly $380–$520 in fuel at 2026 projected national average prices — and protects converters that cost $1,200+ on this platform.
Fix the lean codes once — with all six injectors matched.
- Order the 6 Pcs Fuel Injectors 0280156028 Fit For Mercury Mountaineer Ford Explorer 4.0L while the intake is already off.
- Bulk orders or fitment questions: use the request-for-quote form, email support@koeep.com, or message the team on WhatsApp.
More work on the bench?
Planning a deeper refresh on your Explorer? If you run the 2013–2018 FWD model, pair the fuel system job with this complete suspension upgrade covering front struts, rear shocks, and the sway bar.
- SAE J1832 — fuel injector flow-rate benchmark cited for the 22.5 lb/hr static flow calibration
- SAE J2645 — fuel permeation resistance standard applied to the fluoroelastomer O-ring set
- SAE J2012-DA (2026 release) — diagnostic trouble code definitions used in the DTC mapping above
- SAE J1979-2 and ISO 15765-4 — CAN-bus 3.0 / CAN FD diagnostic polling transport layers
- ISO 7637-2 — electrical transient standard referenced for coil impedance verification
- 6 Pcs Fuel Injectors 0280156028 Fit For Mercury Mountaineer Ford Explorer 4.0L
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