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The Common Rail Fuel Pressure Sensor (Rail Pressure Sensor) with OEM numbers 8-98119790-0 (also listed as 8981197900, 8-97318684-0, 8973186840) is a verified OEM-grade direct replacement for a wide range of ISUZU diesel engines, including the 4HK1, 4JJ1, 6HK1, 6WF1, and 6WG1.
Manufactured by Denso (model 499000-6160) to stringent OEM specifications, this high-pressure sensor is a critical component of the common rail fuel system. It is mounted directly on the fuel rail and continuously monitors the internal fuel pressure, transmitting this data to the Engine Control Unit (ECU). The ECU uses this signal to precisely regulate the Suction Control Valve (SCV) on the high-pressure pump, ensuring stable rail pressure for optimal fuel injection timing, efficient combustion, and reliable engine performance.
This sensor is widely used in ISUZU NPR, NQR, NLR, and NMR trucks, as well as Hitachi and Sumitomo construction equipment powered by ISUZU engines. Manufactured in Japan by Denso, a leading global OEM supplier for diesel fuel injection systems, this sensor is an ideal choice for diesel repair, fuel system maintenance, and fleet service.
OEM Specification — Verified by ISUZU OEM part numbers 8-98119790-0, 8-97318684-0, 8973186840, and Denso model 499000-6160 (also 499000-6131, 499000-6310)
Precision Engineered — Features a 3-pin connector, 22mm installation thread, and operates within a 0-2000 bar working pressure range
Proven Durability — Manufactured by Denso (Japan) with a metal housing designed to withstand extreme fuel pressures and continuous thermal cycling
OEM Cross-Reference Verified — Interchangeable with 499000-6131, 499000-6310, 499000-6160, 8-97318684-1, 8-98119790-1, and 8-98119790-6
Critical Safety Component — Provides the ECU with essential rail pressure data; failure results in limp mode, hard starting, or engine stall
Wholesale Supply — Available for bulk orders with competitive factory pricing
Failure Symptoms
If your rail pressure sensor is failing, you may experience one or more of the following symptoms:
Engine Limp Mode / Reduced Power: The ECU detects an implausible rail pressure signal and limits engine power to protect the fuel system — the most common symptom
Hard Starting / Extended Cranking: Difficulty starting the engine due to incorrect fuel pressure readings during cranking
Rough Idle or Engine Stalling: Unstable rail pressure control causes uneven idle or intermittent stalling, particularly at low speeds
Excessive Exhaust Smoke: Black smoke under load (over-fueling) or white smoke (under-fueling) due to incorrect pressure signal
Diagnostic Trouble Codes (DTCs): Codes such as P0087 (Rail Pressure Too Low), P0088 (Rail Pressure Too High), or P0191 (Fuel Rail Pressure Sensor Circuit Range/Performance)
Poor Fuel Economy: Inefficient combustion due to incorrect rail pressure regulation
Engine Misfire: Uneven combustion across cylinders due to erratic fuel delivery
⚠️ Important: A failing rail pressure sensor can lead to progressive power loss, engine stalling, and potential damage to the high-pressure fuel pump and injectors — prompt replacement with a quality Denso OEM sensor is essential to maintain fuel system integrity and engine reliability.
Middle East, Asia, Africa, South America, North America & Europe
Package
Neutral Packing Or Make It As Requested
Material
High-strength aluminum alloy & precision bearings
Installation
Direct OEM replacement
Quality Standard
OEM equivalent / ISO quality control
Vehicle & Engine Compatibility
⚠️ CRITICAL: This rail pressure sensor is designed for ISUZU 4HK1, 4JJ1, 6HK1, and compatible engines. Verify your engine code and chassis code before ordering.
This rail pressure sensor is designed for ISUZU 4HK1, 4JJ1, 6HK1, 6WF1, 6WG1, and 6UZ1 diesel engines
Quantity Required: 1 per engine
The Denso 499000-6160 is the primary manufacturer model number for this sensor
Compatible with ISUZU NPR, NQR, NLR, NMR, D-MAX, Giga trucks and Hitachi, Sumitomo, Case, Komatsu construction equipment
Please verify your vehicle's chassis code, production year, and engine code before ordering
Features & Benefits
OEM Specification — Denso Genuine Equivalent
Guarantees factory-fit quality and performance — verified by ISUZU OEM part numbers 8-98119790-0, 8-97318684-0, and Denso 499000-6160
Precision 3-Pin Connector
Ensures secure, reliable electrical connection to the engine wiring harness — verified by OEM connector specifications
22mm Installation Thread
Matches the fuel rail mounting port for direct, leak-free installation — verified by OEM thread specifications
0-2000 bar Working Pressure Range
Accurately monitors rail pressure across the full operating range of the common rail system — verified by Denso engineering specifications
Metal Housing Construction
Withstands extreme fuel pressures and continuous thermal cycling without degradation — verified by material specifications
Critical Fuel System Component
Provides the ECU with essential rail pressure data for precise fuel delivery and optimal engine performance
Direct Replacement Fitment
No modifications required — engineered as a direct match for the original sensor
100% New — No Core Charge
Guarantees zero wear, immediate pressure sensing performance, and full service life — no core deposit required
Quality Control & Verification
Our manufacturing and inspection processes ensure every rail pressure sensor meets or exceeds Denso OEM standards.
QC Item
Verification Method
Dimensional Accuracy
Precision inspection to verify 22mm thread pitch and 3-pin connector dimensions match OE blueprint specifications
Pressure Response Test
100% bench testing to verify accurate analog voltage output across the 0-2000 bar range
Leakage Test
100% high-pressure leak test to guarantee zero fuel leakage under operating conditions
Electrical Continuity Test
Full verification of 3-pin connector continuity and signal integrity
Thermal Cycle Test
500+ hour thermal cycling to verify durability under extreme temperatures
Durability Cycle Test
500+ hour pressure cycling to verify long-term reliability
Final Assembly Inspection
100% visual and functional inspection before packaging
Installation & Maintenance Recommendations
⚠️ IMPORTANT: Professional Installation Highly Recommended
Rail pressure sensor replacement requires depressurization of the fuel system, extreme cleanliness, and expert knowledge of common rail systems.
Pre-Installation Checklist:
Depressurize the fuel system before starting work
Disconnect the negative battery terminal
CRITICAL: The common rail fuel system is highly sensitive to contaminated or poor-quality diesel fuel — always use clean, high-quality fuel and replace the fuel filter simultaneously
Clean the area around the sensor and fuel rail to prevent contamination
Depressurize the fuel system and disconnect the negative battery terminal
Locate the rail pressure sensor on the fuel rail
Disconnect the 3-pin electrical connector from the sensor
Remove the sensor using a 22mm deep socket
Clean the mounting port and sensor seat thoroughly
CRITICAL: Install the new sensor with a new copper sealing washer (if applicable)
CRITICAL: Torque the sensor to manufacturer's specified torque settings (refer to ISUZU workshop manual)
Reconnect the electrical connector until it clicks
Reconnect the battery and prime the fuel system
CRITICAL: Bleed air from the fuel system thoroughly to remove all air
Start the engine and check for fuel leaks around the sensor
Clear any diagnostic trouble codes using a scan tool
Maintenance Schedule:
Inspection: Every 50,000 km / 12 months. Check for fuel leaks, limp mode, or increased fuel consumption
Fuel Filter Replacement: Every 20,000-30,000 km — regular filter changes are the single biggest factor in fuel system longevity
Replacement: Recommended at 150,000-200,000 km or immediately if failure symptoms appear
Note: The rail pressure sensor is a critical component of the common rail fuel system — proactive replacement is recommended during major fuel system service
Packaging & Supply
Packaging: Each sensor is securely packed in a neutral box, color box, or customer brand package
Pack Quantity: 1 PC
Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, construction equipment service centers, and fleet owners
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
