Infiniti QX70 Engine Wiring Harness for Sale | OEM Used 3.7L V6 Engine Loom
$250.00
At a Glance
- Condition: OEM used, end-to-end continuity tested before shipping
- Availability: In stock, ready to ship
- Shipping: Free shipping to all 50 states, fast transit
- For Infiniti QX70 (2014 to 2017), confirm by VIN
- Part type: engine wiring harness (loom)
- Material: copper wiring with heat-resistant PVC or Teflon insulation
- Connectors: corrosion-resistant OEM-style
- Voltage: 12V
- Engine: primarily the 3.7L V6, confirm by VIN
- No core charge required
- Backed by a 15 day replacement warranty against operational defects
Description
About the Infiniti QX70 Engine Wiring Harness
The Infiniti QX70 engine wiring harness is the bundle of wires and connectors that links the engine to the sensors, the ignition, the fuel injectors, and the engine control unit. It carries both power and data, so the engine can run correctly and report to the computer. This is a used automotive wiring harness inspected for end-to-end continuity, connector pin condition, insulation flexibility, and loom integrity, with no melted insulation or rodent damage.
If you have chased melted wires, broken connectors, rodent damage, or repeated electrical faults in the engine bay, a sound automotive electrical harness clears those headaches. The QX70 is the renamed FX series, so confirm your exact year, engine, and options, ideally by VIN or OEM part number.
The Engine Harness Is the Critical Section of the Vehicle Wire Loom
The engine harness is the most stressed section of any modern car electrical harness. It lives in the highest-heat zone of the vehicle, accommodates engine vibration over hundreds of thousands of cycles, and routes the highest-current circuits (starter, alternator, fuel injectors, ignition coils) plus the most sensitive data signals (sensor feedback to the PCM). When the engine section of the car wire loom degrades, intermittent faults appear that look like sensor problems but are actually wiring problems. A clean tested engine harness restores reliability to the entire vehicle electrical system without chasing ghost faults across individual sensors. This is why we test end-to-end continuity on every wiring harness for car sale; verified continuity is the only way to confirm the harness is the cause of the symptoms rather than a contributor.
What We Verify
| Item | Details |
|---|---|
| Continuity | End to end, no open or shorted circuits. |
| Pins | Connector pins straight, seated, and clean. |
| Loom | Insulation flexible, loom intact, no melt or chew. |
Things to Confirm Before Ordering
- Exact model year of your QX70 (2014 to 2017)
- Your engine and options, since pinouts vary
- Your VIN or the OEM part number from the old harness
- That you need the engine harness, not another loom
What Ships and What Does Not
| Item | Details |
|---|---|
| INCLUDED | The engine wiring harness as pictured for the build you confirm. |
| NOT INCLUDED | Modules, sensors, and other looms, unless ordered. |
| Tools You Need | Standard hand tools and a qualified technician so every connector lands in the right place. |
Vehicle Compatibility
This Infiniti QX70 engine wiring harness is offered for the following:
| Vehicle | Compatibility |
|---|---|
| Infiniti QX70, 2014 to 2017 | Engine harness, by year and build |
| Renamed FX series, 3.7 V6 | Confirm year, engine, and VIN |
This engine harness is offered for the Infiniti QX70 built from 2014 to 2017, the renamed FX series, mostly with the 3.7L V6. Because options change the pinout, confirm your exact year, engine, and VIN or part number at order. We disclose the donor details before shipping.
Fitment Assistance
Not sure which harness your QX70 needs? Call (855) 634-4447 with your VIN or the part number from your old harness. Our team confirms an exact match and discloses the donor build before your order ships.
Inspection Workflow
Quality control for this part includes:
- End-to-end continuity verified on the circuits
- Connector pins checked for bends, seating, and corrosion
- Insulation checked for flexibility, no cracking
- Loom checked, with no melted insulation or rodent damage
- Donor year documented before packaging
This is a used harness inspected the way wiring should be checked: continuity, pin condition, insulation flexibility, and loom integrity. Replacing an engine harness is a detailed electrical job, so we recommend a qualified technician for correct routing and connection.
Why Buy From Part Nests
- Used OEM Infiniti QX70 engine wiring harness, end-to-end continuity tested before shipping
- Connector pins inspected for clean current passage across every circuit
- Insulation checked for flexibility and integrity
- Loom integrity verified (no melted insulation, no rodent damage)
- Donor year documented before packaging
- Year, engine, and trim compatibility verified by VIN before shipping
- Free shipping to all 50 states, no hidden surcharges
- 15 day replacement warranty on operational defects
- No core charge required
- Call (855) 634-4447 with your VIN or the part number from your old automotive electrical harness for compatibility verification before ordering
Additional information
| Application | 2014 to 2017 Infiniti QX70 |
|---|---|
| Part Type | Engine wiring harness (loom) |
| Material | Copper wiring, heat resistant insulation |
| Connectors | Corrosion resistant OEM style |
| Voltage | 12V |
| Temperature | Works from minus 40 F to 221 F (minus 40 C to 105 C) |
| Weight | 2 to 4 lbs |
| Engine Note | Renamed FX series, mainly 3.7 V6 |
| Fitment Note | Option specific, confirm by VIN or part number |
| Shipping | Free to all 50 states, no core charge |
| Warranty | 15 day replacement warranty from delivery |
| Condition | Used, inspected before shipping |
| SKU | vaz414 |
Terminology. The two are typically used interchangeably in automotive contexts. The wiring harness is the complete assembly: wires, connectors, retaining clips, and any protective covering. The wire loom (sometimes called convoluted tubing or split loom) is specifically the corrugated plastic outer covering that protects and bundles the wires. When customers ask about a "wire loom" they usually mean the complete harness assembly. We supply the complete OEM-style harness including the loom covering.
Common signs of engine harness failure include intermittent or persistent check engine codes that point to multiple unrelated sensors (suggesting common wiring issue rather than individual sensor failures), melted insulation visible in the engine bay (often from a brushed exhaust manifold or contact with another hot component), connector damage (broken locking tabs, bent pins), visible rodent chew damage (mice or rats nesting in stored vehicles), or repeated electrical faults that move between circuits over time.
Same vehicle, renamed. The Infiniti FX was renamed to QX70 for the 2014 model year as part of Infiniti's brand-wide nomenclature change (Q for cars, QX for SUVs). The 2014 to 2017 QX70 is essentially a continuation of the FX35 / FX37 / FX50 from prior years. The engine harness for the 3.7L V6 (V37-series engine) is shared between the late FX37 and the QX70 in many cases. Always confirm by VIN or part number when sourcing across the model name change.
Strongly recommended. The engine harness is a complex part with dozens of connections to sensors, actuators, fuel injectors, ignition coils, and the ECM. Correct routing matters (proximity to heat sources, vibration paths, and exhaust components affects longevity). Connector orientation matters (forcing a connector the wrong way damages pins). DIY-experienced mechanics can install an engine harness with the factory service manual and patience; first-time mechanics should plan for shop labor.
Possibly. The Infiniti QX70 (and predecessor FX) shares the V37-series 3.7L V6 (VQ37VHR) with the Nissan 370Z, Infiniti G37, M37, and Q70 sedans. The base engine wiring is similar across these vehicles. However, vehicle-specific options (audio, climate control, body control modules) integrate differently, so the engine harness varies between vehicles. Always confirm by VIN or part number for cross-vehicle compatibility.
Engine harnesses generally outlast the vehicle, but specific failure modes can occur earlier. Heat damage near the exhaust manifold is the most common premature failure (after 100,000-plus miles in hot climates). Rodent damage can occur at any age in stored or infrequently-used vehicles. Connector pin corrosion is common after 150,000 miles in salt-belt climates. The QX70 (2014 to 2017) is now 8 to 11 years old at the time of writing, so harnesses are starting to enter the typical failure age.
No. The ECM (engine control module) is a separate component that connects to the harness. The harness ships as wiring, connectors, and protective loom only. If your ECM also needs replacement, that is a separate order. We can confirm ECM cross-compatibility with this harness if needed.
No. There is no core return required.
15 Day Replacement Warranty
Every used Infiniti QX70 engine wiring harness purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Operational defects: continuity failures on circuits beyond what was disclosed
- Connector pin damage not disclosed at shipping
- Insulation defects (cracks, melting) beyond what was documented
- Incorrect year or engine variant shipped due to an error on our end
What Is Not Covered
- Damage caused during installation
- Damage from incorrect routing of the harness during install
- Damage from operating with a known short or overload elsewhere in the QX70 car wire loom
- External components (sensors, ECM, ignition coils) unless specifically itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- End-to-End Continuity Verified: Every circuit tested before payment
- Connector Pins Inspected: Straight, seated, and clean
- Insulation Integrity Verified: Flexibility and no cracking confirmed
- Loom Integrity Confirmed: No melted insulation, no rodent damage
- Donor Year Documented: Disclosed before payment
- 15 Day Replacement Cover: Operational defects protected from delivery onward
2 reviews for Infiniti QX70 Engine Wiring Harness for Sale | OEM Used 3.7L V6 Engine Loom
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Vikram S. –
Got a QX70 engine harness for a 2015 QX70 3.7L V6 after the original had developed multiple sensor codes that turned out to be wiring failures rather than individual sensors. End-to-end continuity verified before payment, connector pins inspected, loom integrity documented (no melt, no rodent damage). Resolved the cluster of intermittent codes after install by a qualified technician.
Reema P. –
Sourced a QX70 engine harness for a 2017 QX70 in heavily modified state. Year and engine confirmed by VIN before payment, donor year documented. Honest pre-purchase information about the qualified-technician recommendation for engine harness install. Drop-in replacement after labor visit.