Error P0302 on Nissan: misfire in cylinder 2 - full analysis

Error P0302 on your dashboard Nissan signals a misfire in the second cylinder - a problem that can range from a harmless “glitch” of the sensor to a serious malfunction that threatens damage to the catalytic converter within 1–2 thousand km of driving while ignoring the error. Owners Qashqai J10/J11, X-Trail T31/T32 And Juke F15 they encounter it especially often, but the reasons and solutions are universal for most models with gasoline engines HR16DE, MR20DE And QR25DE.

In this article we will look at exact symptoms errors P0302 (from “triple” at idle to jerking during acceleration), we list all possible reasons - from banal spark plugs to problems with the timing belt, and we’ll also give step by step instructions for diagnostics and repair. We will pay special attention common mistakes in self-repair, which only make the problem worse, and we’ll explain why sometimes “resetting the error” by the scanner is the worst thing you can do.

What does error P0302 mean on Nissan?

Code P0302 stands for «Cylinder 2 Misfire Detected» — the engine control unit (ECU) has detected a misfire in the second cylinder. It is important to understand that the ECU does not “guess” the problem, but analyzes:

• 🔥 Uneven crankshaft rotation (via crankshaft position sensor - DPKV).
• 📊 Deviations in the operation of the ignition coil (based on feedback signal).
• 🚗 Data from lambda probes (if the fuel does not burn, the oxygen sensors detect an imbalance).

The ECU records an error if the gaps exceed 2–2.5% of the total number of ignition cycles. At the same time P0302 can be either constant or floating (appears and disappears). The last case is especially insidious: the driver ignores the problem until it develops into catalyst damage or cylinder head gasket failure.

On Nissan with motors HR16DE (1.6 l) and MR20DE (2.0 l) error is often accompanied by codes P0300 (random omissions) or P0301/P0303 (missing cylinders 1 or 3). This indicates systemic problem - for example, valve wear or a malfunction of the ignition module.

P0302 Symptoms: How to Recognize the Problem

Misfire in the second cylinder manifests itself differently depending on the severity of the malfunction. Early on you may notice:

• ⚠️ Unstable idle speed (the tachometer needle “jumps” in the range of 600–900 rpm).
• 💨 Vibration on the steering wheel/body, especially at low speeds (often confused with wheel imbalance).
• 🚘 "Jerking" during acceleration (feeling as if the car is being “braked” by an invisible force).
• 🔊 Popping sounds in the exhaust system (unburned fuel burns out in the catalyst).

On Nissan Qashqai And X-Trail with motor MR20DE When trouble code P0302 is often observed increased fuel consumption (by 10–15%) and loss of power (the car stalls when overtaking). In advanced cases, the ECU can put the engine into emergency mode (Limp Mode), limiting the speed to 3000–3500 rpm.

Critical symptom - smell of gasoline from the exhaust pipe. This means that the fuel does not burn in the cylinder, but enters the catalyst, which is fraught with overheating and destruction. If you ignore the problem, repairing the exhaust system will cost 50–150 thousand rubles. (depending on model).

⚠️ Attention: If error P0302 is accompanied white smoke from the exhaust And engine overheating, stop the car immediately! These are the signs cylinder head gasket breakdown or cracks in the cylinder block - further driving will lead to water hammer and overhaul.

The main causes of error P0302 on Nissan

The causes of misfire in the second cylinder are divided into three groups: Ignition, fuel system and mechanical problems. Below - full checklist indicating the probability for Nissan.

Reason	Probability, %	Symptoms
Faulty spark plug	35%	Misfires on a cold engine, black deposits on the electrode
Ignition coil breakdown	25%	The error appears in wet weather, cracks in the coil body
Air leak (vacuum leak)	20%	Unstable idle, hissing under the hood
Low compression in cylinder 2	10%	The engine “troubles” constantly, oil in the spark plug well
Clogged injectors	10%	Misfires under load, black smoke from exhaust

On Nissan Juke And Note with motor HR16DE most often to blame ignition coils (especially after 100 thousand km). On X-Trail T32 And Qashqai J11 with MR20DE common problem with air leakage through the crankcase ventilation valve (PCV). In both cases, the P0302 code may be accompanied by a code P0171 (“lean mixture”).

Less often, the reason lies in ECU (for example, after unsuccessful chip tuning) or wiring (oxidized contacts of sensor connectors). It is impossible to diagnose such faults without a scanner - a check is required oscilloscope or multimeter.

Swap spark plugs for cylinders 2 and 3 (if the error goes to P0303, the spark plug is to blame)

Check the ignition coil for breakdown (inspect for cracks, check resistance)

Measure the compression in cylinder 2 (standard: 12–14 bar for HR16DE/MR20DE)

Check fuel pressure (normal: 3.5–4 bar for most Nissans) -->

How to Diagnose Error P0302: Step-by-Step Instructions

Diagnostics can be conveniently divided into three stages: visual inspection, scanning using a scanner and instrumental diagnostics. Let's start with the simplest.

1. Visual inspection

Open the hood and follow these steps:

1. Remove decorative engine cover (if any).
2. Inspect ignition coil 2 cylinders for cracks, melting or traces of breakdown (black dots).
3. Unscrew spark plug from 2 cylinders and compare it with others:
   • 🔴 Black soot - rich mixture or oil in the combustion chamber.
   • 🟤 White soot - lean mixture or overheating.
   • 🟠 Red soot - low-quality fuel with additives.

Check wires and connectors coils for oxidation.

2. Check with a scanner (ELM327, Launch, Autel)

Connect the diagnostic scanner and pay attention to:

• 📊 Sensor parameters:
  • STM (short test) And LTM (long test) misfires.
  • Lambda probe 1 (Bank 1, Sensor 1) - if it shows a “lean” mixture (>1.05), look for air leaks.
• 🔧 Related errors:
  • P0171/P0174 - air leak.
  • P0202 — malfunction of the injector of cylinder 2.
  • P0300 — random omissions (system problem).

On Nissan with the system Direct Injection (For example, MR16DDT in Qashqai J11) pay attention to the parameter Fuel Trim. If it exceeds +10%, this indicates air leak or faulty MAF sensor.

3. Instrumental check

For an accurate diagnosis you will need:

• 🔧 Compressometer — measure the compression in cylinder 2 (norm: 12–14 bar, spread between cylinders no more than 1 bar).
• 🔌 Multimeter — check the resistance of the ignition coil (norm: 0.5–1.5 Ohm for the primary winding, 8–12 kOhm for the secondary).
• 🛠️ Stethoscope — listen to the operation of the injector of cylinder 2 (there should be uniform clicks).

If the compression in cylinder 2 is below normal, perform leak test (supply compressed air at a pressure of 6–7 bar through the spark plug hole). Determine where the air is going by the sound:

• 🔊 Hissing from a nearby spark plug well — breakdown of the cylinder head gasket.
• 🔊 Gurgling noise in the expansion tank — a crack in the block or cylinder head.
• 🔊 Whistling from the exhaust pipe - leaky exhaust valve.

How to resolve error P0302: from simple to complex

Repair depends on the cause of the problem. Below - step by step instructions for every case, from the simplest to the most important.

1. Replacing spark plugs

On Nissan It is recommended to use candles with platinum or iridium plated:

• 🔧 For HR16DE: NGK IFR6T11 or Denso FXE20HR11.
• 🔧 For MR20DE: NGK ILFR6D or Denso IKH20.

Replacement procedure:

1. Remove ignition coil (disconnect the connector, unscrew the bolt).
2. Unscrew the spark plug 16 mm spark plug wrench.
3. Clean the well from oil/dirt (use compressed air).
4. Install a new spark plug, tighten firmly 20–25 Nm.

2. Checking and replacing the ignition coil

Coils on Nissan often fail after 80–100 thousand km. Signs of malfunction:

• 💥 Cracks on the body.
• 🔌 Melted contacts.
• 📉 Resistance is outside the norm (measured with a multimeter).

To replace:

1. Disconnect power connector.
2. Unscrew the fastening bolt (10 mm).
3. Remove the coil and install a new one (original: Nissan 22448-JM01A for MR20DE).

⚠️ Attention: On motors QR25DE (for example, in X-Trail T31) ignition coils individual for each cylinder. Do not confuse them when replacing - this will lead to errors P0300–P0304!

3. Elimination of air leaks

Air leaks are one of the most insidious causes of P0302. On Nissan Most often the culprits are:

• 🔧 Crankcase ventilation valve (PCV) - clogged with oil.
• 🔧 Tube from air intake to throttle - cracks over time.
• 🔧 Intake manifold gasket - tans and lets air through.

To check:

1. Start the engine and pinch the PCV hose. If the speed stabilizes, the valve is faulty.
2. Process soap solution intake manifold joints. Bubbles will indicate the location of the leak.

4. Cleaning the injectors

Clogged injectors lead to uneven fuel injection. For cleaning:

1. Remove rack with nozzles (you will need to remove the intake manifold).
2. Connect the injectors to washing stand (or use ultrasonic bath).
3. Rinse special liquid (For example, Wynn’s Injection System Purge).

If the nozzle doesn't click when power is applied - replacement is required (original for HR16DE: Nissan 16600-JM00A).

5. Repair with low compression

If the compression in cylinder 2 is lower 10 bar, you will need:

• 🔧 Replacing piston rings (if cylinder wear is normal).
• 🔧 Valve lapping (unless they are sealed).
• 🔧 Replacing the cylinder head gasket (if there is a breakdown).

On Nissan with motors MR20DE And QR25DE often helps decarbonization (without disassembling the engine). To do this:

1. Unscrew the spark plugs.
2. Fill into cylinders decoking liquid (For example, LAVR ML202).
3. Leave for 12 hours, then crank the engine with the starter (without starting).
4. Replace the oil and filter (decarbonization contaminates the oil).

Common mistakes when repairing P0302

Many owners Nissan aggravate the problem by following “advice from the Internet.” Here the most dangerous misconceptions:

• ❌ “I’ll reset the error with a scanner and everything will go away”. The ECU records consequences the problem, not the cause. Resetting without repair will result in damage to the catalyst.
• ❌ “I’ll change all the spark plugs and the leaks will disappear.”. If the reason is the coil or air leaks, replacing the spark plugs will not help.
• ❌ “Add the additive to the fuel and the injectors will be cleaned”. Additives only help with light soiling. Heavily clogged injectors require ultrasonic cleaning.
• ❌ “If I replace the coil with a used one, I’ll save money”. Used reels often have hidden defects (microcracks). It is better to buy a new one or check the resistance before installation.

Another common mistake is ignoring associated codes. For example, if together with P0302 there is P0171 (“lean mixture”), and you only change the spark plugs, the problem will remain. In this case you need look for air leaks or check MAF sensor.

On Nissan Qashqai J10 with motor MR20DE common wiring defect — chafing of the ignition coil harness on the intake manifold bracket. If not installed protective corrugation, the problem will return after 10–20 thousand km.

When to call for service: signs of serious problems

Some problems that cause the P0302 code cannot be resolved on your own. Go to service immediately, if:

• 🔥 The engine is constantly shaking, even after replacing spark plugs and coils.
• 💨 White smoke comes out of the exhaust pipe (a sign of coolant entering the cylinder).
• 🛢️ Oil in spark plug well (a symptom of worn valve seals or cylinder head gaskets).
• 📉 Compression in cylinder 2 below 8 bar (requires major repairs).
• ⚡ The ECU goes into emergency mode (Limp Mode) on every trip.

The service must carry out:

• 🔍 Diagnostics on a professional scanner (For example, Launch X431 or Bosch KTS).
• 🛠️ Checking timing belt phases (broken marks lead to misfires).
• 🔧 Endoscopy of cylinders (to assess the condition of pistons and valves).

Cost of diagnostics in the service: 1.5–3 thousand rubles.. Engine overhaul (for example, Qashqai J11 with MR20DE) will cost 80–150 thousand rubles., therefore early diagnosis will save you money.

What happens if you ignore P0302?

Long-term driving with misfires leads to:

1. Overheating and destruction of the catalytic converter (replacement - from 30 thousand rubles).

2. Fuel getting into the oil, which reduces its lubricating properties and leads to scoring on the cylinder walls.

3. Damage to lambda probes (the cost of a new sensor is 5–10 thousand rubles).

4. Cylinder detonations, which can lead to cracks in the pistons or cylinder head.

FAQ: answers to frequently asked questions about error P0302

Is it possible to drive with P0302?

Short-term (before service) - possible, but no more than 500–1000 km. Driving for a long time with misfires will lead to damage to the catalyst And fuel getting into the oil, which will reduce engine life. If the error appears only on a cold engine, the risk is less, but diagnosis should not be delayed.

Why does error P0302 appear only when cold?

This is a typical sign:

• 🔥 Worn spark plugs (a cold engine requires a more powerful spark).
• 🔧 Air leakage through a crack in the intake manifold (when heated, the metal expands and the gap “closes”).
• 🛢️ Stuck piston rings (compression is lower in cold weather due to thick oil).

Start diagnostics with replacing spark plugs And checking the collector for leaks.

I reset the P0302 error, but it came back. What to do?

Resetting an error without eliminating the cause is a useless measure. If P0302 returns:

1. Check ignition coil 2 cylinders for breakdown (even if visually it is intact).
2. Measure compression in cylinder 2.
3. Inspect wiring from the ECU to the coil (wires often fray).
4. Check nozzle for cloggedness (can be swapped with cylinder 3 - if the error goes to P0303, the injector is faulty).

What spark plugs are best to install on a Nissan with error code P0302?

For engines Nissan candles with platinum or iridium central electrode:

• NGK: IFR6T11 (HR16DE), ILFR6D (MR20DE).
• Denso: FXE20HR11 (HR16DE), IKH20 (MR20DE).
• Bosch: FR7DPX (universal for most models).

Avoid cheap candles with copper electrode — they fail after 20–30 thousand km. The gap on new spark plugs should be 0.8–1.1 mm (check with a dipstick).

Can bad fuel cause P0302?

Yes, but only temporarily. Low quality gasoline with lower octane rating 92 or with impurities leads to:

• 🔥 Detonation (explosive combustion of fuel that damages the pistons).
• 🛢️ Pollution