P0300 on Nissan Teana: misfire - what to do?

Error code P0300 on Nissan Teana (especially on models J31 And J32 with engines VQ25DE, VQ35DE or QR25DE) is one of the most common problems that owners face. This code indicates random/multiple misfires, but without specifying a specific cylinder. Unlike errors P0301-P0306, which are tied to a specific cylinder, P0300 requires a comprehensive approach to diagnosis, as the causes may lie in the ignition system, fuel supply, engine mechanics or even electronics.

If the dashboard lights up Check Engine, and the scanner showed P0300, do not rush to change spark plugs or coils - in 40% of cases the problem lies deeper. In this article we will analyze all possible reasons (from commonplace to rare), diagnostic methods without expensive equipment, and also give step-by-step instructions for troubleshooting. We will place special emphasis on Teana J32 with engine VQ35DE, where the error is often related to wear of phase regulators or throttle valve contamination.

What does error P0300 mean on Nissan Teana?

Code P0300 stands for "Random/Multiple Cylinder Misfire Detected" - that is Random misfire detected in several cylinders. Electronic control unit (ECU) fixes this error when:

• 🔥 Oxygen sensors (lambda probes) register unstable combustion of fuel in the cylinders.
• ⚡ Crankshaft position sensor (CKP) records uneven rotation of the crankshaft (which indicates “triple”).
• 🛢️ The fuel supply system does not provide the required pressure or mixture composition.
• 🔌 The ECU detects misfires, but cannot identify a specific cylinder (unlike P0301-P0306).

On Nissan Teana error P0300 often accompanied by the following symptoms:

• 🚗 Engine troubles (especially at idle or during acceleration).
• ⚡ Power Loss — the car accelerates poorly and is “stupid.”
• 🔥 Floating speed (from 500 to 1500 rpm without pressing the gas).
• 💨 Increased fuel consumption (10–20% above normal).
• 🔊 Popping sounds in the exhaust system (due to unburnt fuel in the catalyst).

It is important to understand that P0300 is not a diagnosis, but a symptom. It can be caused by a dozen different reasons, from worn spark plugs to faulty ECU. Therefore the first step is correct diagnosis.

The main causes of error P0300 on Nissan Teana

Based on repair statistics Teana J31/J32 can be distinguished TOP-7 reasons appearance P0300:

Reason	Frequency of occurrence	Cost of elimination (RUB)
Worn spark plugs or high-voltage wires	35%	1 500–4 000
Malfunction of ignition coils	25%	3,000–12,000 (for 1 piece)
Dirty or faulty throttle valve	15%	1,000–5,000 (cleaning + adaptation)
Problems with phase regulators (VVTi)	10%	8,000–25,000 (replacement + adjustment)
Low fuel pressure (faulty fuel pump or regulator)	8%	5 000–20 000
Air leaks (cracks in the manifold, gaskets)	5%	2 000–10 000
Malfunction of lambda probes or catalyst	2%	6 000–30 000

On Teana J32 with engine VQ35DE most often to blame ignition coils (especially with mileage >150 thousand km) or phase regulators (after 200 thousand km). On Teana J31 with QR25DE the problem is usually related to throttle valve or air leak through cracks in the intake manifold.

⚠️ Attention! If the error P0300 appears along with P0171 (“Lean mixture”), most likely the problem is air leaks or faulty mass air flow sensor (MAF). If, together with P0300 are burning P0301-P0306, the coil or spark plug in a particular cylinder is to blame.

How to diagnose P0300 on a Nissan Teana without a scanner?

Not everyone has a diagnostic scanner, but preliminary check can be done without it. Here is a step-by-step algorithm:

1. Check the spark plugs for carbon deposits or cracks

2. Inspect the high-voltage wires for breakdowns (sparks are visible in the dark)

3. Listen to the engine at idle - the vibration increases when the coil of each cylinder is turned off in turn

4. Check the tightness of the intake manifold (with the engine running, spray carburetor cleaner onto the joints - if the speed changes, there is suction)

5. Measure the fuel pressure (standard for VQ35DE: 3.5–4.0 bar) -->

If you have multimeter, you can check:

• 🔋 Ignition coil resistance (norm: 0.5–1.0 Ohm on the primary winding, 8–12 kOhm on the secondary).
• 🔌 Crankshaft position sensor voltage (should be 0.5–0.7 V at idle).
• 🛢️ Fuel pressure (connect the pressure gauge to the fuel rail).

For a more accurate diagnosis, you will need a scanner that will show:

• 📊 Lambda probe parameters (should fluctuate in the range of 0.1–0.9 V).
• 🔄 Ignition timing (if the cylinders differ greatly, the problem is in the coils).
• 🌡️ Coolant temperature (if the sensor is lying, the ECU incorrectly adjusts the mixture).

⚠️ Attention! On Nissan Teana J32 with VQ35DE common false alarm P0300 due to a faulty knock sensor. Before replacing the coils, check its resistance (normal: 500–600 kOhm).

Step-by-step instructions: how to fix P0300 on a Nissan Teana

Depending on the cause, repair methods will vary. Let's consider the most effective solutions for each of them.

1. Replacement of spark plugs and high-voltage wires

If the spark plugs have not been changed >60 thousand km, they definitely needs to be replaced. For Nissan Teana recommended:

• 🔥 NGK IFR6T11 (original for VQ35DE).
• 🔥 Denso IT20TT (analogue for QR25DE).

Also check gap between electrodes (normal: 1.0–1.1 mm). If the wires have cracks or punctures, replace them with a set.

2. Checking and replacing ignition coils

On Teana J32 coils often fail after 100–150 thousand km. Symptoms:

• ⚡ Troubling increases in wet weather.
• ⚡ Error P0300 appears after the engine warms up.

To check, swap the coils - if the error “moves” to another cylinder, the coil is to blame. Original coils for VQ35DE — Nissan 22448-4M215 (price ~8,000 rub.). Analogues: Bosch, Denso.

3. Cleaning the throttle valve

On Teana J31 the throttle valve often becomes dirty, which leads to unstable speed And P0300. For cleaning:

1. Remove the damper (unscrew the 4 bolts).
2. Clean it up carburetor cleaner (do not use metal brushes!).
3. Swipe throttle adaptation through a scanner (or reset the negative battery terminal for 10 minutes).

4. Diagnostics of phase regulators (VVTi)

On VQ35DE phase regulators wear out after 200 thousand km. Symptoms:

• 🔧 Noise (knock) when the engine is idling.
• 🔧 Error P0300 + P0011/P0021 (phase shift).

To check:

1. Remove the valve cover.
2. Check the play of the phase regulator gear (if >1 mm, replacement is required).

5. Checking the fuel system

If the fuel pressure is below normal (for VQ35DE — 3.5–4.0 bar), check:

• 🛢️ Gasoline pump (winding resistance: 0.5–1.5 Ohm).
• 🛢️ Fuel pressure regulator (often gets stuck in the open position).
• 🛢️ Fuel filter (replace every 40 thousand km).

How much does it cost to repair a P0300 on a Nissan Teana?

The cost of repair depends on the cause and region. Approximate prices (for 2026):

Type of repair	Cost (RUB)	Operating time (hours)
Replacing spark plugs (set)	1 500–3 000	0.5–1
Replacing the ignition coil (1 pc.)	3 000–12 000	1–2
Throttle valve cleaning + adaptation	1 500–4 000	1–1.5
Replacing phase regulators (set)	15 000–30 000	4–6
Diagnostics of air leaks (smoke test)	2 000–5 000	1–2

If you plan to repair yourself, consider:

• 🔧 Ignition coils on Teana J32 change in 30 minutes (you need a 10 mm wrench).
• 🔧 Phase regulators require removal of the valve cover and a special tool to fix the camshafts.
• 🔧 Throttle valve It can be cleaned without removal, but adaptation is required (otherwise the speed will float).

⚠️ Attention! On Nissan Teana with engine VQ35DE after replacing phase regulators necessarily you need to reset the ECU adaptations via a scanner (for example, Launch X431 or Delphi). Without this error P0300 may stay!

Common mistakes when repairing P0300

Many owners Nissan Teana make mistakes that lead to reappearance of P0300:

• 🚫 Replacing only one coil - if one fails, the rest will soon fail too (replace as a set!).
• 🚫 Ignoring throttle adaptation — after cleaning, the speed will float until the ECU “learns.”
• 🚫 Saving on candles - cheap candles (for example, Beru or Champion) often cause omissions on VQ35DE.
• 🚫 Compression failure - if the omissions are caused worn rings or valves, replacing the coils will not help.

Another common mistake is resetting the error without eliminating the cause. If you just erase P0300 through the scanner, it will return after 50–100 km.

What happens if you ignore P0300?

If you drive for a long time with an error P0300, this will result in:

1. Catalyst overheating (may melt, the price of a new one is from 30,000 rubles).

2. Damage to pistons and rings due to detonation.

3. Increased oil consumption (due to fuel getting into the crankcase).

4. Damage to lambda probes (replacement cost - from 5,000 rubles per piece).

FAQ: Frequently asked questions about error P0300 on Nissan Teana

Is it possible to drive with P0300?

Short term - yes, but not recommended. Long-term driving with misfires leads to catalyst overheating, increased engine wear And increased fuel consumption. If the error appears for the first time, you can drive to the service station, but no more than 200–300 km.

Why does P0300 only appear when cold?

If an error occurs only on cold start, the most likely reasons:

• 🔥 Spark plug wear (the spark is weaker when cold).
• 🛢️ Low fuel pressure (the fuel pump is worn out and does not create the required pressure when starting).
• 🌡️ Faulty coolant temperature sensor (The ECU does not correct the mixture correctly).

What spark plugs are best for VQ35DE?

For VQ35DE optimal options:

• 🔥 NGK IFR6T11 (original, resource ~60 thousand km).
• 🔥 Denso IT20TT (analogue, a little cheaper).
• 🔥 Bosch FR7DPX (good option, but requires checking the clearance).

Not recommended: Champion, Beru, Brisk - often cause omissions.

Could P0300 be due to bad gas?

Yes, low quality fuel (with impurities or low octane) may cause detonation and misfires. If the error appears after refueling, try:

1. Top up octane corrector (For example, Liqui Moly).
2. Dilute gasoline high octane fuel (for example, fill 20 liters of 98).
3. If the error does not go away - drain bad gasoline and flush the fuel system.

Do I need to change the phase regulators if there is a knocking noise, but there are no errors?

If phase regulators knocking, but there are no errors, this means that they not jammed yet, but already worn out. Recommended:

• 🔧 Check the gear play (if >1 mm, replace it).
• 🔧 Flush the lubrication system (sometimes the knocking noise disappears after replacing the oil with 5W-40 with a high content of detergent additives).
• 🔧 If the knocking does not disappear, replace the phase regulators set (otherwise the knocking will return after 20–30 thousand km).