Catalog

MAN 51274210178 PRESSURE SENSOR

MAN 51274210178 PRESSURE SENSOR

Product Specifications

Product quality
OEM Equivalent Grade
starstarstar
On request
bolt MOQ (Minimal order)
1 pcs
local_shipping Production time
30 days
package_2 Shipping Weight: —
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MAN 51274210178
MAN 51274210229
MAN 51274210236
MAN 7701068401
Overview & Operating Principle
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The PRESSURE SENSOR is a piezoelectric or piezoresistive transducer threaded into a fluid or gas circuit that converts the mechanical deformation of a sensing diaphragm under pressure into an electrical signal — either a switched on/off output for threshold detection or a continuous analogue or digital voltage output proportional to absolute or gauge pressure. Pressure sensors are deployed across multiple vehicle systems: oil pressure sensors protect the engine by triggering a warning when lubrication pressure drops below a safe threshold; fuel rail pressure sensors provide the ECU with continuous rail pressure data for injection timing and duration calculation in GDI and common rail systems; MAP (manifold absolute pressure) sensors measure intake manifold vacuum for load calculation on naturally aspirated and turbocharged engines; boost pressure sensors monitor turbocharger output; and tyre pressure monitoring system (TPMS) sensors measure individual wheel inflation pressure and transmit data wirelessly to the BCM.

This unit — MAN 51274210178 — is manufactured to OEM-equivalent specifications: pressure range and measurement type (gauge or absolute), output signal type and voltage range, thread size and sealing method, operating temperature range, and connector pinout are matched to the original part. Supplied as a direct plug-and-play replacement for standard fitment. Available wholesale from 0.18 USD, MOQ 1 pcs, production lead time 30 days.

Pressure sensors fail through diaphragm fatigue from pressure cycling, contamination of the sensing element by oil carbon deposits or coolant scale, connector corrosion in underbonnet moisture, and thread seal failure causing fluid ingress into the sensor body. Before condemning a pressure sensor, verify supply voltage and ground at the connector with a multimeter and compare live sensor output on a scan tool against the known operating range for the system — a sensor reading fixed at minimum or maximum of its range with supply voltage confirmed present is the definitive sign of internal element failure.

Symptoms & Diagnostics
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Oil pressure warning light illuminated at idle or under load — confirm with a mechanical gauge before replacing the sensor; a sensor reading zero pressure with confirmed supply voltage indicates sensor failure, but the same warning from a genuinely low oil pressure condition requires immediate engine shutdown and mechanical investigation before any sensor replacement.
Check Engine light with fuel rail pressure codes P0087, P0088, P0190–P0194 — the fuel rail pressure sensor is reporting a value outside the expected range for current operating conditions; verify actual rail pressure with a calibrated gauge to distinguish a genuine pressure fault from a sensor signal fault before replacing injectors or the high-pressure pump.
Check Engine light with MAP sensor codes P0105–P0109 — the manifold pressure sensor output is fixed, erratic, or implausible relative to throttle position and engine speed; the ECU defaults to a fixed load estimate, causing rich or lean fuelling and reduced performance.
Boost pressure fault codes P0234, P0235, P0299 on turbocharged engines — the boost pressure sensor is reading below or above target boost; confirm whether the fault is caused by a sensor signal error or an actual boost leak or wastegate fault by checking live sensor data against actual manifold pressure.
TPMS warning light illuminated with a specific wheel identified as low pressure — either genuine tyre deflation or a failed in-wheel TPMS sensor; confirm actual tyre pressure with a calibrated gauge before assuming sensor failure; TPMS sensor batteries have a service life of 5–10 years and cannot be replaced separately from the sensor unit.
Fluid leak at the sensor thread or sensor body — the thread seal has failed allowing oil, coolant, or fuel to escape around the sensor mounting; a leaking sensor must be replaced immediately as pressure-system fluid loss is a fire or lubrication hazard depending on the circuit.
Logistics & Customs
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International HS Code
9026.20
EAEU Customs Code (TN VED)
9026 20 200 0
Typical Net Weight
Country of Manufacture
China
Standard MOQ
1 pcs
Production Lead Time
30 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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  1. Depressurise the relevant system before removing any pressure sensor — shut the engine down and allow oil pressure to dissipate; depressurise the fuel system by removing the fuel pump fuse and cranking; release cooling system pressure via the expansion tank cap with a cold engine; release turbo boost by allowing the engine to idle for 30 seconds before shutdown. Never remove a pressure sensor from a live pressurised system.
  2. Disconnect the negative battery terminal before removing sensors in oil, fuel, or high-voltage circuits. Read and record all stored fault codes with an OBD-II scanner before disconnecting anything — some fault codes are erased when the battery is disconnected and the diagnostic information is lost.
  3. Verify supply voltage and ground at the sensor connector with a multimeter before removing the sensor — a sensor reading out of range with no supply voltage present has a wiring fault, not an internal failure. Replacing the sensor without fixing the wiring fault will result in the same fault code on the new unit within seconds of startup.
  4. Use the correct sensor socket — pressure sensors use thin-wall hex profiles that are damaged by standard sockets. Apply penetrating oil to the thread and allow to soak before attempting removal on corroded installations. Never use adjustable pliers on a sensor body as this rounds the hex and may crack the sensor housing, releasing pressurised fluid.
  5. Fit a new sealing washer or O-ring on the sensor thread before installation — always use the seal supplied with the new sensor or specified in the OEM parts list. Apply thread sealant only where specifically required by the OEM procedure for that sensor position; most modern pressure sensors use a copper crush washer or O-ring that seals dry without sealant.
  6. Install the new PRESSURE SENSOR (MAN 51274210178), torque to OEM specification, reconnect the wiring connector, reconnect the battery, refill any fluid lost during removal, start the engine, and verify the sensor output on live scan tool data is within the expected range for operating conditions before clearing stored fault codes and returning the vehicle to service.
Tools: OBD-II scanner with live data, thin-wall pressure sensor socket set, torque wrench, multimeter, penetrating oil, new sealing washer or O-ring, appropriate fluid for top-up.
Frequently Asked Questions
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How can I confirm the pressure sensor has failed rather than the system it is monitoring?
The definitive test is to compare the sensor's electrical output against independently measured actual pressure. For oil pressure, connect a mechanical gauge to the sender port and compare readings at idle and at 3,000 RPM. For fuel rail pressure, use a calibrated fuel pressure gauge at the Schrader valve. For MAP and boost sensors, use a hand vacuum/pressure pump connected to the sensor port and observe the live scan tool output as you vary the applied pressure — a healthy sensor produces a smooth linear output across its range. A fixed output that does not respond to applied pressure confirms internal element failure. ok.parts supplies replacement sensors at wholesale MOQ from 0.18 USD per unit for diagnostic stock.
Is ECU adaptation or system relearning required after replacing a pressure sensor?
Most pressure sensors are read directly by the ECU without adaptation — clear stored fault codes and the system operates normally immediately. Exceptions include TPMS sensors, which must be registered to the BCM using a TPMS programming tool after replacement so the system can associate the new sensor's unique ID with the correct wheel position. Fuel rail pressure sensors on some common rail diesel systems may require an injector quantity adaptation reset via a scan tool after replacement if the ECU has accumulated correction values based on the old sensor's drift.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
PartReason for Combined Replacement
Sensor Sealing Washer / O-Ring
Copper, aluminium, or NBR — application-specific		The pressure sensor thread seal is a single-use component that must be replaced every time the sensor is removed from a pressurised system. A reused crush washer or O-ring will not provide a reliable seal under operating pressure and temperature, causing an immediate or early fluid leak at the sensor port.
Related Pressure-Regulating Component
Pressure regulator, relief valve, or bypass valve		A pressure sensor fault code can indicate either sensor failure or a genuine pressure deviation caused by a failing pressure regulator, relief valve, or pump. Always verify actual system pressure independently before replacing the sensor — if actual pressure is confirmed outside specification, the pressure-controlling component must be addressed alongside or instead of the sensor.
Wiring Harness Repair Kit
Application-specific connector and pins		Connector pin corrosion and harness chafing at the sensor location are a frequent cause of pressure sensor fault codes. If the connector shows pin corrosion, heat damage, or the harness insulation is cracked, repair or replace the affected section alongside the new sensor to prevent the same fault code recurring on the new unit within a short period.