Error code P0725 on Nissan Murano Z51: complete analysis of the problem

Fault code P0725 on Nissan Murano Z51 (third generation, 2015–2021) signals problems with engine speed sensor (Engine Speed Sensor). This error can manifest itself in different ways: from unstable engine operation to complete startup failure. Unlike other codes related to the transmission or fuel system, P0725 is often ignored by owners until the car begins to become “stupid” while driving or stall at idle.

Feature Murano Z51 with engines VQ35DD (3.5 l) and QR25DER (2.5 l hybrid) is that the speed sensor is integrated into engine control unit (ECU) or associated with crankshaft via a separate connector. In 80% of cases, the problem lies not in the sensor itself, but in the wiring, oxidized contacts or ECU firmware failures. However, without proper diagnosis, you can spend thousands replacing faulty parts.

In this article we will look at:

• 🔍 What exactly does it mean? P0725 for Murano Z51 and how it manifests itself.
• 🛠️ Step-by-step diagnostics: from scanner to multimeter.
• 💰 Cost of repairs in service vs. self-removal.
• ⚠️ Typical repair mistakes and how to avoid them.

What does error code P0725 mean on Nissan Murano Z51?

Code P0725 stands for «Engine Speed Input Circuit Malfunction» — malfunction of the engine speed sensor circuit. B Murano Z51 this sensor can be of two types:

• 🔄 Induction (on the crankshaft) - generates a signal when the metal rotor rotates.
• 📶 Hall (in the ECU) - reacts to changes in the magnetic field.

The ECU uses data from the sensor to:

• 🔥 Control of ignition timing and fuel injection.
• 🚗 Gearbox control (on models with CVT Xtronic).
• 📊 Calculation of fuel consumption and exhaust gases.

If the signal from the sensor is missing or distorted, the ECU goes into emergency mode, which leads to:

• ⚠️ Sunbathing Check Engine and icon SLIP (on the dashboard).
• 🐢 Loss of power, jerking during acceleration.
• 🔌 Refusal to start the engine (in severe cases).

Reasons for error P0725

B Murano Z51 code P0725 The following problems most often cause:

Reason	Probability, %	Symptoms
Oxidation of sensor contacts or ECU connector	40%	Intermittent tanning Check Engine, signal loss in wet weather
Broken or shorted wiring	25%	Constant error, engine stalls or does not start
Faulty speed sensor (crankshaft)	20%	Uneven engine operation, error is not reset
ECU firmware failure	10%	Multiple errors (P0335, P0720), "glitches" of electronics
Mechanical damage to the crankshaft gear	5%	Engine knocking, metal shavings in oil

Important: On hybrid versions Murano Z51 (with QR25DER) error P0725 may appear due to a signal conflict between the crankshaft sensor and the electric motor rotor position sensor. In this case, diagnostics of the hybrid system is required. Nissan Hybrid System.

A common mistake owners make is to immediately change the speed sensor without checking the wiring. For example, in Murano 2017 model, the wire from the sensor to the ECU runs under the exhaust manifold and can rub against the bracket. This results in a short circuit that kills the new sensor within a week.

How to Diagnose P0725: Step-by-Step Instructions

For diagnosis you will need:

• 🔧 Scanner OBD-II (For example, Launch CReader or ELM327).
• 📊 Multimeter with diode testing function.
• 🔍 Endoscope (for inspecting connectors).

Step 1: Reading errors

• 🔌 Connect the scanner to the connector OBD-II (located under the steering wheel, to the left of the brake pedal).
• 📋 Write down all fault codes. If in addition P0725 There is P0335 (Crankshaft Position Sensor Circuit), the problem is definitely in the sensor or wiring.
• 🗑️ Reset the errors and check if they appear again after starting the engine.

Step 2: Checking the speed sensor

• 🔍 Locate the sensor on the crankshaft (to the right of the oil filter, under the intake manifold).
• 🔌 Disconnect the connector and check the contacts for oxidation.
• 📊 Measure the resistance of the sensor (standard for Murano Z51: 800–1200 Ohm). If it shows 0 or ∞ - the sensor is faulty.

Step 3: Checking wiring and ECU

• 🔍 Inspect the wiring harness from the sensor to ECU (located under the hood, next to the battery).
• 📊 Check the circuit for a break: between the contact 1 sensor and contact 45 ECU connector (diagram for Murano Z51 2019).
• ⚠️ If the circuit resistance is greater 1 ohm, there is a break. If less 0.5 ohm - short circuit.

⚠️ Attention: On hybrid versions Murano Z51 Before checking the speed sensor, be sure to disconnect the high-voltage battery (negative terminal for 10 minutes). Otherwise, you risk burning the multimeter or getting an electric shock.

How to fix error code P0725: repair or replace?

Depending on the cause, repairs may take from 30 minutes to several days. Here are typical scenarios:

1. Oxidation of contacts or broken wiring

If the problem is in the contacts:

• 🧹 Clean the sensor connectors and ECU special spray (for example, CRC Contact Cleaner).
• 🔧 Replace damaged wires (use heat shrink tubing for insulation).
• 📌 Secure the tourniquet so that it does not touch hot or sharp parts.

2. Faulty speed sensor

If the sensor is dead:

• 🛒 Buy an original sensor (Nissan 23731-4M01A for VQ35DD or 23731-6M51A for QR25DER).
• 🔧 Replacement takes 20–40 minutes. The main thing is not to lose the o-ring.
• ⚠️ After replacement, reset adaptations ECU via a scanner (for example, Nissan Consult).

3. ECU firmware failure

If the error appears along with P0603 or P0605:

• 💻 Re-flashing required ECU (in the service it costs 5–10 thousand rubles).
• 🔄 Sometimes resetting the settings via Nissan DataScan (free).

What should I do if the error remains after replacing the sensor?

This means the problem is not with the sensor, but with the ECU or wiring. In 90% of cases, a ground break is to blame (check the contact on the body under the ECU) or incorrect firmware of the unit. Murano Z51 Hybrids may require sensor synchronization via Nissan Consult III Plus.

Service repair cost:

• 🔍 Diagnostics: 1,500–3,000 rub.
• 🔧 Sensor replacement: RUB 2,000–4,000. (with work).
• 💻 ECU flashing: 5,000–12,000 rub.

Common repair mistakes and how to avoid them

Many owners Murano Z51 encounter a relapse of the error P0725 due to the following errors:

⚠️ Attention: Never use a speed sensor from Nissan X-Trail T32 or Pathfinder R52 - they are similar in appearance, but have a different resistance (400–600 Ohms versus 800–1200 Ohms for Murano Z51). This will result in incorrect readings and damage. ECU.

Frequent mistakes:

• 🔌 Failure to reset ECU adaptations after replacing the sensor. This leads to “floating” revolutions and an error P0507 (high idle).
• 🔧 Using non-original sensors (For example, Febi or Meyle). They fail after 10–20 thousand km.
• 📉 Ignoring weight check. On Murano Z51 the mass of the speed sensor goes to the body through a bolt under ECU - if it is oxidized, the signal will be unstable.

How to avoid problems:

• 📋 Always record original errors (even if they seem unrelated P0725).
• 🔍 Before replacing the sensor, check the voltage on the contacts ECU (must be 5 V between 1 and 2 contacts of the sensor connector).
• 💡 If after repair the error returns after 1-2 days, look for the problem in ECU or hybrid system (for QR25DER).

P0725 on the hybrid version of the Murano Z51: features

On Nissan Murano Z51 with a hybrid installation (QR25DER + electric motor) error P0725 often accompanied by:

• 🔋 Code P0A7F (hybrid battery malfunction).
• 🚗 Jerks when switching from an electric motor to an internal combustion engine.
• 📉 Power drop in mode Eco Mode.

Reasons specific to the hybrid:

• 🔌 Signal conflict between the crankshaft sensor and the electric motor rotor position sensor.
• 💻 Sync failed between ECU And Hybrid Control Module.
• 🔋 Low voltage high voltage battery (less 200 V).

Repairing the hybrid version is more difficult:

• 🔧 Diagnostics required Nissan Consult III Plus (regular OBD-II the scanner will not show hybrid system errors).
• 💰 Replacing the speed sensor costs 2 times more (due to the need to reset the hybrid system adaptations).
• ⚠️ Work on a high-voltage battery must be carried out by a certified service center (risk of electric shock 300 V).

Prevention of error P0725 on Nissan Murano Z51

To avoid reappearance P0725:

• 🛢️ Change the oil every 7,500 km (contaminated oil accelerates wear on the crankshaft gear).
• 🔌 Clean your contacts once a year ECU and sensors with a special spray.
• 🚗 Avoid driving through deep puddles - water gets into the connectors and oxidizes the contacts.
• 💻 Check the firmware every 50 thousand km ECU for relevance (especially after chip tuning).

On hybrid versions additionally:

• 🔋 Monitor the condition of the high-voltage battery (resource - 150-200 thousand km).
• 🔌 Do not connect uncertified chargers - they can disrupt the synchronization of the sensors.

If your Murano Z51 often stuck in traffic jams or operated in Start/Stop, the speed sensor wears out faster. In this case it is recommended:

• 🔧 Every 100 thousand km, check the condition of the sensor (even if there are no errors).
• 📊 Use a scanner to monitor a parameter Engine RPM in real time (must be stable at idle).

Frequently asked questions (FAQ)

Is it possible to drive with P0725?

Short term - yes, but not recommended. The engine will operate in emergency mode: increased fuel consumption, jerking, risk of overheating. On hybrid Murano Z51 ignoring the error may result in damage Hybrid Control Module.

How much does the original speed sensor for Murano Z51 cost?

Prices for 2026:

• VQ35DD (3.5 l): 4,500–6,000 rub. (Nissan 23731-4M01A).
• QR25DER (2.5 l hybrid): 7,000–9,000 rub. (Nissan 23731-6M51A).

Analogs (for example, Denso or Hitachi) are 30–40% cheaper, but their resource is lower.

Is it possible to reset P0725 without a scan tool?

Yes, but temporarily:

1. Disconnect the negative terminal of the battery for 15 minutes.
2. Start the engine and let it idle for 5 minutes.

However, if the cause is not eliminated, the error will return after 10–50 km. This method does not work on hybrid versions - it is required Nissan Consult.

What should I do if the error remains after replacing the sensor?

Check:

• Integrity of wiring from sensor to ECU (especially under the exhaust manifold).
• Contact voltage ECU (must be 5 V).
• Synchronization of sensors on hybrid versions (required Nissan Consult III Plus).

If everything is fine, the problem is ECU (needs flashing or replacement).

What other errors can appear along with P0725?

Frequent "companions":

• P0335 - Malfunction of the crankshaft position sensor circuit.
• P0720 — open circuit of the output shaft speed sensor.
• P0603 - memory error ECU.
• P0A7F - hybrid battery problem (only for QR25DER).