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What the 1076647 pressure switch does

The Power Steering Pump Pressure Switch Sensor for Ford Focus MK1 MK2 C-MAX (1076647) is a normally-closed, diaphragm-actuated switch that threads into the hydraulic pump and reports line pressure to the Powertrain Control Module (PCM). Ford fitted it across the C170 and C1 platforms, so it covers the Focus MK1, Focus MK2 and C-MAX.

Its job matters at parking speed. The pump works hardest during slow maneuvers, and that load drags engine speed down at idle. The switch watches hydraulic pressure in real time and tells the PCM when to raise idle through the idle-air control (IAC) system. When it fails you get stalls at full lock and, sooner or later, a check engine light.

Ford's service bulletin TSB 06-22-14 references this sensor for the Focus (1998–2011), Focus MK2 (2004–2011) and C-MAX (2003–2010), including European LHD/RHD, North American and Australian-delivered vehicles. The 1076647 replacement from Koeep is built under ISO/TS 16949-certified quality systems with a CuZn36Ni2 high-nickel brass diaphragm assembly and FKM (Viton®) seals that resist ethanol-blended power steering fluid.

2026 quick facts

• CAN compatibility: backward-compatible with CAN 2.0B, so the 2026 CAN-bus 3.0 question gets a yes. The analog signal is interpreted by the PCM and never sits on the CAN physical layer.
• DTC codes it can trigger: P0550, P0551, P0552, P0553 and P0554.
• OEM cross-reference: Ford 1076647 / 1 076 647, Finis codes 1125764, 1232116 and 1330745, plus Motorcraft CMS-302.
• Projected service life: 10+ years / 150,000 km under normal PSF service intervals, validated to 2026–2030 lifecycle projections.

How the switch works

Actuation at 275 to 345 kPa

A precision-calibrated diaphragm sits inside a nickel-plated brass body. When hydraulic pressure passes roughly 275 to 345 kPa (40 to 50 psi), the point where the pump moves from idle-bypass into active assist, the diaphragm deflects and opens the normally-closed circuit. That open state is the PCM's cue to cancel the IAC step-up command, because the pump no longer needs the idle bump.

The signal path

The sensor returns a 0 to 5V analog signal that the PCM reads directly; the signal never travels on the CAN bus. On Focus MK2 vehicles it lands on Pin 18 of the C175E connector. Any reading outside the 0.25V to 4.75V rational window for more than 3 consecutive drive cycles sets a pending P0551, and the Malfunction Indicator Lamp (MIL) lights on the fourth event.

What changed for 2026

Contacts moved from silver-cadmium oxide (AgCdO) to silver-tin oxide (AgSnO₂) under the EU RoHS Recast (EU 2024/3016), which removes cadmium and improves arc-erosion resistance. Seals moved from NBR to FKM (Viton®) for better resistance to ethanol-blended and synthetic power steering fluids.

The diaphragm substrate now runs ≥99.5% Al₂O₃ purity against the original 96% spec. That cuts micro-porosity and holds long-term drift under 0.5% of full scale across the 150,000 km interval, and the braze joint uses CuSil-ABA active-braze alloy.

Three failure modes field data keeps reporting

• Diaphragm fatigue cracking at the ceramic-metal braze joint. Fluid leaks into the electrical connector and shorts the pull-up resistor to ground, which reads as P0552.
• Contact welding from sustained high-current inrush, usually traced to degraded IAC stepper motors. The 2026 revision adds integrated flyback diode protection against it, and the stuck circuit reads as P0553.
• Thread-seal degradation at the pump housing. Vibration-induced micro-fretting breaks down the M14×1.5 tapered thread seal, so the part ships with pre-applied Loctite 577.

Full spec comparison: OEM vs Koeep 2026

The switch is manufactured to SAE J1926 and SAE J514 with ISO 4400 electrical mating compliance, and every unit passes 100% end-of-line pressure-cycling validation.

DTC mapping: P0550 to P0554

• P0550, Circuit Malfunction: open circuit, disconnected connector or harness break.
• P0551, Range/Performance: drift beyond the ±0.25V rational window, or no toggling during steering input.
• P0552, Low Input: signal below 0.25V, usually PSF shorting to ground or contacts welded closed.
• P0553, High Input: signal above 4.75V, contacts welded open, or a PCM pull-up resistor fault.
• P0554, Intermittent: erratic toggling over multiple drive cycles, typically a loose terminal or early diaphragm delamination.

The range follows the SAE J2012 / ISO 15031-6 definitions. Codes read through Mode $03 (stored) and Mode $07 (pending) on any SAE J1979-compliant scan tool, and PID $15 (PSP_STAT) in Mode $01 shows the live switch state.

Fitment and engine coverage

Koeep SKU 1076647 supports Focus MK1 (1998–2004, C170 platform), Focus MK2 (2004–2011, C1 platform) and C-MAX (2003–2010, C1 platform). The switch is shared across every engine variant fitted to those cars:

• 1.4L Duratec (FXJA)
• 1.6L Duratec (HWDA/HXDA)
• 1.8L Duratec (EYDB/EYDC)
• 2.0L Duratec (EDBA/EDBB)
• 2.5L Duratec ST (HYDA)
• 1.6L TDCi (HHDA/HHDB)
• 1.8L TDCi (KKDA/KKDB)
• 2.0L TDCi (IXDA/G6DA)

Where it does not fit

The Focus MK3 (2011–2018) runs Electric Power Steering with no hydraulic pump, so the part has no function there. Certain C-MAX 1.6 TDCi variants from 2007 onwards moved to electro-hydraulic power steering (EHPS). Check for a hydraulic pump before you order; one look in the engine bay settles it.

Related parts and guides

For the wider catalog, the Koeep Steering & Suspension Parts collection groups this switch with the rest of the steering and suspension line.

Steering work wears the wheel rim too. Koeep also stocks a Carbon Fiber & PU Leather hand-sewing wrap cover for the Ford Fusion and a Black & Hole leather wrap cover with red stitching for the Ford F-150.

If the car is a 2000 to 2007 Focus with a cooling problem as well, the CU2296 aluminum radiator guide for the 2.0L and 2.3L L4 engines covers that side in detail.

Frequently asked questions

Order the 1076647 or ask a fitment question

Need a fitment check first? Send your vehicle details through the request for quote page, email support@koeep.com, or message the team on WhatsApp.