• Denso 4JJ1 rail pressure relief valve for Isuzu, showing the metal component with threaded connection and pressure relief mechanism.
  • Denso 4JJ1 rail pressure relief valve for Isuzu diesel engine, showing the compact metal valve with connection ports.
  • Denso 4JJ1 Rail Pressure Relief Valve for Isuzu diesel engines, showing the metal valve component and pressure relief mechanism.
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Denso

4JJ1 Rail Pressure Relief Valve - Isuzu - 8-98032549-0

4JJ1 Rail Pressure Relief Valve - Isuzu - 8-98032549-0

$367.00 NZD
$367.00 NZD
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Rail Pressure Relief Valve – Isuzu 4JJ1 – 8-98032549-0

🚚 Free Express AU 💳 Afterpay • Humm • Klarna • Zip 🛠 Direct Replacement

Genuine Denso / Isuzu mechanical rail relief valve for common 4JJ1 applications. Restores stable rail pressure and helps resolve intermittent limp or hot-soak pressure bleed issues when the original valve sticks or leaks.

🧩 Overview

Factory-spec relief valve designed to protect the common-rail system and maintain commanded pressure under load. A like-for-like replacement with OEM sealing and durability.

🔧 Suits / Compatibility
  • Isuzu D-MAX / MU-X — 4JJ1
  • Holden Colorado / Rodeo — 4JJ1

Compatibility varies by year/trim. Always match your original part number or message us with your VIN.

✨ Features
  • OEM sealing and opening pressure
  • Stabilises rail pressure to reduce limp events
  • Direct fit to the common-rail gallery
  • No ECU coding or tuning required
📦 What’s Included
  • 1 × Genuine Denso rail pressure relief valve (sealed)

Install to clean, lint-free standards and torque to factory spec.

🛠 Install Notes
  • Match by part number before install
  • Clean rail port and use correct torque from the service manual
  • After replacement, clear stored DTCs and verify commanded vs. actual rail pressure
⚠ Important Notes
  • This part is not a tuner upgrade — it restores OEM function
  • If limp persists, check SCV, injectors (return), rail sensor and fuel supply
💳 Payment & 🚚 Shipping
  • Afterpay • Humm • Klarna • Zip available
  • Free Express Shipping Australia-Wide — fast, trackable dispatch

❓ FAQs

Will this fit my vehicle?
If your original valve matches one of the listed numbers, it will fit. Send your VIN and we’ll confirm.
What are the cross-reference numbers?
Denso: 095420-0260, 095420-0280, 095420-0190 • GM/Holden: 98032549 • Isuzu: 8-98032549-0, 8-97318691-0.
Do I need tuning after installation?
No. This is a like-for-like OEM-spec part. Clear fault codes after installation.
Is this new or reconditioned?
Brand new Genuine Denso/Isuzu valve, sealed in original packaging.
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