The 23731-AW400 crankshaft position sensor is listed as a replacement sensor for Nissan applications and is also associated with OE/OEM reference 949979-0090. The verified product data does not name a specific Nissan model, year, engine, trim, or installation position, so a brand match alone is not enough. Before ordering, confirm the complete OE number and compare the connector, pin count, sensor length, mounting points, insert style, and original part photos.
This guide explains how to evaluate the part using only the information verified on the NexuParts product record. It also separates symptom-based diagnosis from fitment verification. A no-start, intermittent stall, misfire, or crankshaft-signal fault may justify testing the system, but none of those observations proves that this exact sensor fits the vehicle or has failed.
What the 23731-AW400 Crankshaft Position Sensor Listing Confirms
The product is identified as a crankshaft position sensor. Its listed OE/OEM references are 23731-AW400 and 949979-0090, while the NexuParts SKU is 23731-AW400. Nissan is the compatible vehicle brand listed, and the package contains one sensor. Current photos, price, and availability are available on the 23731-AW400 Nissan crankshaft position sensor product page.
No specific model or year range is verified in the listing. That omission is important: do not infer compatibility from another seller's description, a search result, or a visually similar Nissan sensor. Use the VIN and a reliable vehicle-specific parts reference to establish whether 23731-AW400 or 949979-0090 is correct for the exact engine and installation position.
Symptoms Are a Reason to Diagnose, Not a Fitment Method
The product record notes that a failing or incorrect crankshaft position sensor may be associated with a no-start condition, random stalling, misfire, or crankshaft-position signal faults. Those symptoms can also require checks elsewhere in the system, so they should not be used as a shopping shortcut.
Record the full diagnostic information, follow service data for the vehicle, inspect the wiring and connector where appropriate, and identify the sensor already installed. Diagnosis determines whether a replacement is needed; the OE number and physical configuration determine which replacement to consider.
23731-AW400 Crankshaft Position Sensor Buying Checklist
1. Match both listed OE references
Look for 23731-AW400 or 949979-0090 on the original component, packaging, repair record, or trusted catalog. Compare every character, including suffixes and separators. A close or partially matching number should not be treated as equivalent without reliable cross-reference evidence.
2. Confirm the exact Nissan application
Because the verified listing does not specify a model, model year, engine, or trim, these details must come from a vehicle-specific source. Use the VIN when possible. Confirm the engine and the intended crankshaft sensor location rather than assuming all Nissan vehicles use the same configuration.
3. Compare the connector housing
Review the plug shape, keying, latch position, and orientation. The connector should align with the vehicle harness without modification. A housing that looks similar from one angle may differ at the locking tab or key, so compare several clear views.
4. Count the visible terminals
Compare the pin count and visible terminal arrangement with the original sensor. Do not force a connector onto a part with a different terminal layout. If the product image does not make the terminal arrangement clear, request an additional comparison before purchase.
5. Compare length and insert style
Check the sensor body's overall proportions, probe length, tip shape, thread or insert style, and the way the sensor seats. Small differences can change the installed position even when the connector looks correct. Use measurements or a reliable technical reference when visual comparison is inconclusive.
6. Verify the mounting points
Compare mounting tabs, bracket position, bolt-hole location, and the angle between the mount and connector. The sensor should match the original mounting arrangement without bending, drilling, or modification.
7. Confirm package quantity
The listing includes one crankshaft position sensor. Product images show the actual or compatible replacement style for comparison. Do not assume that fasteners, brackets, wiring, or unrelated components are included unless they are explicitly shown and stated.
Camshaft and Crankshaft Sensors Are Not Interchangeable
A crankshaft position sensor and a camshaft position sensor are different parts, even though both relate to engine-position signals and may appear near each other in search results. For example, NexuParts also lists a 371F-3611011 camshaft position sensor for its own Chery applications. That product has a different function, OE reference, vehicle application, connector, and physical form. It is linked for comparison only and is not an alternative to 23731-AW400.
Common Ordering Mistakes to Avoid
- Ordering because the listing says Nissan without confirming the exact model and engine
- Using symptoms or a diagnostic code as proof that one specific sensor is required
- Matching only part of 23731-AW400 or 949979-0090
- Ignoring connector keying, pin count, sensor length, mounting tabs, or location
- Confusing a crankshaft position sensor with a camshaft position sensor
- Installing or modifying an electrical part before completing the side-by-side comparison
You can browse more sensor and electrical replacement products in the Lighting & Electrical collection. A collection helps organize related parts, but it does not establish interchangeability. Each item still requires its own OE-number, vehicle, connector, mounting, and location check.
What to Check Before Installation
Professional installation is recommended. Before work begins, obtain service information for the exact vehicle and confirm the sensor location, access method, connector release, removal sequence, mounting specification, electrical checks, and any other vehicle-specific requirements. This article does not provide a universal installation procedure.
Place the new and original sensors side by side before installation. Compare the OE markings, plug shape, latch, pin count, length, tip, insert style, mounting point, bracket angle, and overall proportions. If any detail differs, stop and resolve the fitment question before the sensor is installed or modified.
Frequently Asked Questions
Which Nissan models use 23731-AW400?
The verified NexuParts listing identifies Nissan as the compatible brand but does not specify models, years, engines, or trims. Confirm the exact application through a reliable VIN- or vehicle-specific catalog.
Is 949979-0090 also listed for this sensor?
Yes. The product record lists both 23731-AW400 and 949979-0090 as OE/OEM references. Confirm the cross-reference for the exact vehicle before relying on it.
Can a no-start condition confirm this part is bad?
No. A no-start or other symptom requires diagnosis. It does not identify one failed component or confirm the correct replacement part.
What photos should I send for fitment help?
Provide clear images of the original OE markings, connector, visible terminals, sensor body, tip, mounting tab, and installation location. Include the VIN, year, model, engine, original part number, and product link.
How many sensors are included?
The package contains one crankshaft position sensor.
Final Verification Before Ordering
Before adding the 23731-AW400 / 949979-0090 crankshaft sensor to your cart, confirm the exact Nissan application and both OE references. Then compare the connector, terminals, length, tip, insert style, mounting points, bracket position, and current product images. When the catalog evidence and physical details agree, you have a stronger basis for selecting the correct 23731-AW400 crankshaft position sensor.
