P0325 on Nissan: How to Diagnose & Fix
Knock Sensor 1 Circuit Malfunction (Bank 1)
2 Nissan models · 2 documented issues · $80-$700 repair
P0325 on Nissan by model: symptoms, diagnosis and fix
A well-documented failure on first-generation Frontier V6 trucks is the distributor assembly, especially the internal cam/crank angle sensor and bearing wear inside the distributor. Owners report intermittent bucking, random stalling, hard starts, and eventual crank-no-start, often after the engine warms up. Nissan issued service information for distributor-related drivability faults, and owner complaint patterns are consistent across Frontier and related Xterra applications using the VG33E/VG33ER.
Common Symptoms
- engine stalls while driving
- crank but no start
- hard hot restart
- intermittent misfire or bucking
- tachometer drops suddenly
- check engine light
How to Fix
Diagnosis usually includes checking for loss of spark/injector pulse, monitoring cam/crank signal, and inspecting distributor shaft play or oil contamination. In most cases the fix is replacement of the complete distributor assembly rather than only the cap/rotor, followed by base timing verification where applicable and inspection of plugs/wires if misfire damage occurred.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Nissan Value Advantage complete distributor B2100-0W00JNW
Confirm VIN, naturally aspirated versus supercharged application and current supersession.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipUse a complete OE-quality distributor rather than the cheapest aftermarket unit; many owners report repeat failures with low-cost reman parts.
Sources for this issue (2)
Nearly every high-mileage 4th-gen Maxima eventually sets a P0400 (EGR flow insufficient) code. The root cause is almost never the EGR valve itself; instead the small EGR pipe and the port where the EGR temperature sensor sits pack with carbon, so exhaust gas can no longer flow past the sensor and the ECU reports low EGR flow. It commonly appears alongside a P0325 knock-sensor 'ghost' code. This is a classic emissions-inspection failure item on these cars.
Common Symptoms
- Check engine light
- Failed emissions/inspection
- Occasional rough idle
- P0400 with intermittent P0325
How to Fix
Remove the EGR tube/passage and the EGR temperature sensor, then clear the carbon with a pick and carburetor cleaner; clean the ports and passages rather than replacing the valve. Inspect/replace the EGR temp sensor if damaged. Full EGR valve replacement is only needed if the valve itself is stuck.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- CRC throttle body and air intake cleaner 05078
Universal solvent consumable, not a vehicle-fit part. Follow label/SDS and service procedure; keep away from sensors, coatings and friction/electrical surfaces not approved by the manufacturer.
- Genuine Nissan EGR valve gasket 14719-38U00
Direct listing covers 1995-1999 VQ30DE Maxima; confirm VIN and disassembly path.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
P0325 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0325 mean on a Nissan?
P0325 stands for "Knock Sensor 1 Circuit Malfunction (Bank 1)." This code indicates a fault in the knock sensor 1 circuit on Bank 1. The knock sensor listens for the vibrations of detonation (pinging/spark knock) and lets the computer retard ignition timing to protect the engine. When the sensor's signal is missing, out of range, or the circuit is open/shorted, P0325 sets. With knock detection compromised, the computer may run more conservative timing, causing reduced power and slightly lower fuel economy, and the engine is less protected against damaging knock. On Nissan it is documented across 2 models: Frontier, Maxima.
What are the most common causes of P0325?
The most common causes of P0325 are: Failed knock sensor, Corroded or loose knock sensor connector, Damaged, open, or shorted sensor wiring, Improperly torqued or loosely mounted sensor, Moisture or corrosion in the connector, Wiring harness chafing near the engine, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0325 on a Nissan?
Published repair estimates on Nissan range from $80 to $700 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.