Replacing spark plugs with Nissan X-Trail T31 (2007–2013) - a procedure that many owners put off until the last minute, until the engine starts to “trouble” or catches fire Check Engine. Meanwhile, worn spark plugs increase fuel consumption by 5–15%, reduce acceleration dynamics and can lead to detonation in the cylinders. In this article we will look at which candles are suitable for X-Trail T31 with motors MR20DE (2.0 l) and QR25DE (2.5 l), how to replace them correctly with your own hands, and what nuances to pay attention to so as not to damage the threads in the block head.

Standard replacement regulations for Nissan X-Trail T31 - every 30–40 thousand km for ordinary nickel spark plugs and 90–100 thousand km for iridium or platinum. However, the actual period depends on the quality of the fuel, driving style and operating conditions. For example, with frequent driving over short distances (when the engine does not warm up completely) or using gas (gas), the spark plugs wear out faster. We analyzed owner reviews and service manuals to create a checklist of signs indicating the need for replacement, and selected the best analogues of the original spark plugs Nissan taking into account the price/quality ratio.

Signs of worn spark plugs on a Nissan X-Trail T31

The first symptoms of problems with spark plugs are often attributed to low-quality fuel or clogged injectors. However, if you notice at least 2–3 signs from the list below, the probability of spark plug wear exceeds 80%. It is especially critical to ignore these signals on engines QR25DE, where faulty spark plugs can cause misfires and catalytic converter damage.

  • 🔥 Difficult start engine, especially when it’s cold or after a long period of parking. The starter turns, but the engine “suffices” after 3–5 attempts.
  • ⚡ Dips during acceleration — the car jerks when accelerating, as if it is “stumbling.” It most often appears at speeds of 2000–3000 rpm.
  • 🛢️ Increased fuel consumption — the dashboard shows +1–2 liters per 100 km without objective reasons (for example, in winter or with a load).
  • 🔊 Unstable operation at idle — the speed “floats” in the range of 600–900 rpm, the engine vibrates.
  • 🚨 Check Engine with error codes P0300 (multiple misfires), P0301–P0304 (misfires in a specific cylinder).

On Nissan X-Trail T31 With a mileage of over 100 thousand km, wear of the spark plugs can be disguised as other problems: for example, air leaks through cracks in the intake manifold or malfunction of the ignition coils. To accurately diagnose the cause, check the spark plugs visually: black carbon deposits (rich mixture) or white deposits (lean mixture) indicate problems with the fuel system, not with the spark plugs. If the electrodes are melted or have traces of oil on them, a comprehensive diagnostic is required.

📊 How often do you change spark plugs on your Nissan X-Trail T31?
  • Every 30 thousand km
  • Every 50 thousand km
  • Only when problems arise
  • I don't know when it was last changed

Original spark plugs and best analogues for X-Trail T31

Official catalog Nissan offers for X-Trail T31 two main articulations of spark plugs depending on engine type:

  • 🔧 For MR20DE (2.0 l) — 22401-JM00A (iridium) or 22401-4M000 (nickel).
  • 🔧 For QR25DE (2.5 l) — 22401-5M000 (iridium) or 22401-4M015 (nickel).

However, original spark plugs are often replaced with analogues from NGK, Denso or Bosch, which are not inferior in quality, but cost 30–50% less. Below is a compatibility table taking into account the thermal number and clearance, relevant for the Russian market (2026).

Engine Original article Analogue (NGK) Analogue (Denso) Analogue (Bosch) Gap, mm
MR20DE (2.0 l) 22401-JM00A IFR6A11 (iridium) IK16 (iridium) FR7DPX (platinum) 1.1
MR20DE (2.0 l) 22401-4M000 BKR6E-11 (nickel) K16PR-U11 FR7DCX 1.1
QR25DE (2.5 l) 22401-5M000 IFR5A11 (iridium) IK20 (iridium) FR5DPX 1.0
QR25DE (2.5 l) 22401-4M015 BKR5E-11 (nickel) K20PR-U11 FR5DCX 1.0

When choosing analogues, pay attention to thermal number (for X-Trail T31 Range 5–6 is suitable) and the material of the central electrode. Iridium spark plugs last longer, but their price is justified only for mileages exceeding 20 thousand km per year. For most owners, the best option is platinum spark plugs. Bosch or NGK, which can withstand 60–80 thousand km without loss of characteristics.

⚠️ Attention: On engines QR25DE after 2010, spark plugs with a reduced gap were installed (1.0 mm instead of 1.1 mm). Using spark plugs with the wrong gap leads to misfires and an error. P0300. Always check the gap with a feeler gauge before installation!

Tools and preparation for replacing spark plugs

To replace spark plugs Nissan X-Trail T31 No specialized equipment is required, but there are several nuances that will simplify the process:

  • 🔧 Candle key with magnetic or rubber grip (size 16 mm for MR20DE And QR25DE). A regular socket wrench will not work - it will not hold the spark plug when removing it.
  • 🔧 Extension cord for a key (minimum 10 cm) - without it it is almost impossible to get to the spark plugs in the 4th cylinder.
  • 🔧 Torque wrench (optional, but recommended) - spark plug tightening torque for aluminum cylinder head 20–25 Nm.
  • 🧴 Penetrating lubricant (For example, WD-40 or Liqui Moly) - if the spark plugs have not been changed for more than 5 years, the threads may “stick”.
  • 🧲 Gap gauge - even with new spark plugs, the gap may differ from the declared one.

Before starting work, be sure to cool the engine to temperatures below 40°C - a hot block head increases the risk of thread failure. Also disconnect the negative terminal of the battery to avoid a short circuit if you accidentally touch the ignition coils. If this is your first time changing spark plugs X-Trail T31, take a photograph of the location of the high-voltage wires or coils - this will help you avoid confusing them during reassembly.

Disconnect the battery (minus terminal)

Cool down the engine (temperature < 40°C)

Prepare the tool (16 mm wrench, extension, torque wrench)

Clean the area around the spark plug wells (vacuum cleaner or compressed air)

Check the gap on new spark plugs (should correspond to the table above) -->

Step-by-step instructions for replacing spark plugs

Replacement process Nissan X-Trail T31 takes about 1–1.5 hours for the first experience. The main difficulty is access to the spark plugs in the 3rd and 4th cylinders, where the pipes and intake manifold interfere. Below are detailed instructions taking into account typical errors.

Step 1. Removing the ignition coils

On engines MR20DE And QR25DE ignition coils are bolted 10 mm. Unscrew them in the following order:

  1. Remove the plastic engine cover (if equipped).
  2. Disconnect the power connector from the coil (press the latch and pull up).
  3. Unscrew the bolt securing the coil and carefully remove it, rocking it from side to side.

Do not pull on the high voltage wire - this may damage the contact inside the coil. If the coil is stuck, use penetrating lubricant and a plastic puller.

Step 2. Removing old spark plugs

Before unscrewing the spark plugs necessarily Blow out the spark plug wells with compressed air or a vacuum cleaner. Debris getting into the cylinder will lead to scoring on the walls and costly repairs. Next:

  1. Place the spark plug wrench and extension onto the spark plug and turn it counterclockwise to move it out of place.
  2. If the spark plug does not budge, do not apply force - treat the thread with lubricant and wait 10–15 minutes.
  3. Remove the spark plug and inspect it for damage (melting, oil on the threads).
What to do if a candle breaks off in a well?

If the central electrode or spark plug body remains in the cylinder head:

1. Do not try to unscrew the remaining parts with a wrench - this will damage the thread.

2. Use a special candle extractor (for example, Lisle 65600).

3. If the extractor does not help, you will need to remove the cylinder head to drill out the fragment.

In 90% of cases, the problem occurs due to excessive tightening torque during a previous replacement or thread corrosion.

Step 3. Installing new spark plugs

Before installation, check the gap on the new spark plugs (should correspond to the table above). Next:

  1. Carefully insert the candle into the well without distortions - if it becomes crooked, the thread will be damaged.
  2. Tighten the spark plug in two stages:
    • First from hand to stop.
    • Then use a torque wrench with a torque 20–25 Nm (or “by hand” with force, as when tightening the cap of a plastic bottle).
  • Install the ignition coils in reverse order, making sure the power connectors snap into place.
    • 💡

    If you don't have a torque wrench on hand, use the following method: tighten the spark plug by hand until it stops, then use the wrench to tighten it 1/4 turn (for new spark plugs) or 1/8 turn (for used spark plugs). This approximately corresponds to a torque of 20–25 Nm.

    Common mistakes and how to avoid them

    Even experienced car owners make mistakes when replacing spark plugs. Nissan X-Trail T31which lead to serious consequences. Here are the most common of them and ways to prevent them:

    • 🔧 Re-upholstery of candles — leads to deformation of the threads in the aluminum block head. Consequence: repair required with installation of inserts (helicoil or timesert).
    • 🔧 Using candles with the wrong heat rating. The candles are “colder” than normal (NGK BKR7E) cause carbon deposits, “hot” (NGK BKR5E) - glow ignition.
    • 🔧 Debris getting into the cylinders when removing spark plugs. Consequence: scoring on the cylinder walls, decreased compression.
    • 🔧 Mixing up high voltage wires (on models before 2010). Leads to misfire and error P0300.

    An error with the tightening torque on engines is especially dangerous. QR25DE, where the block head is made of aluminum alloy A356. If the torque exceeds 30 Nm, the thread is cut off and the head will need to be removed to restore it. If you are not confident in your abilities, use torque limiter (for example, an adjustable ratchet wrench).

    ⚠️ Attention: On X-Trail T31 With a mileage of over 150 thousand km, the threads in the spark plug wells may be worn out. Before replacing spark plugs, check their condition with an endoscope (or flashlight). If metal delamination or rust is visible, contact a service center to install threaded inserts.

    When is it necessary to replace spark plugs ahead of schedule?

    The regulatory 30–40 thousand km for nickel spark plugs is a conventional figure. Under real operating conditions Nissan X-Trail T31 spark plugs can fail much earlier. Here are the factors that reduce their resource:

    • 🛢️ Fuel quality: Using gasoline with an octane number below 92 or the presence of additives accelerates the formation of carbon deposits on the electrodes.
    • 🚗 Short trips: If the engine does not warm up to operating temperature, wet carbon will form on the spark plugs.
    • 🔥 Engine overheating: leads to melting of the electrodes and a change in the gap.
    • 💨 Oil in the combustion chamber: indicates wear on the oil seals or piston rings. In this case, the candles become covered with a black oily coating.

    If your X-Trail T31 is operated in one of these modes, reduce the spark plug replacement interval by 20–30%. For example, when driving on gas (gas), nickel spark plugs last no more than 20 thousand km, and iridium spark plugs last up to 50 thousand km. It is also recommended to use “gas” spark plugs with a smaller gap (0.8–0.9 mm), since the gas-air mixture ignites worse than gasoline.

    💡

    Signs that the spark plugs require urgent replacement (even if the mileage is less than the required mileage): difficult starting in cold weather below -15°C, engine vibration at idle, the smell of gasoline from the exhaust pipe.

    FAQ: Frequently asked questions about replacing spark plugs on Nissan X-Trail T31

    Can I use spark plugs from other Nissan models (for example, Qashqai J10)?

    Yes, but with reservations. Candles from Nissan Qashqai J10 with engine MR20DE (2.0 l) fully compatible with X-Trail T31 the same volume. However for QR25DE (2.5 l) only candles from Qashqai with a similar motor (for example, Qashqai+2). Always check the article by VIN code or catalog Nissan.

    What happens if you don’t change spark plugs for more than 100 thousand km?

    With such a mileage, the electrodes of the spark plugs wear out to a critical state: the gap increases to 1.5–2.0 mm, which leads to:

    • Misfire and error P0300.
    • Damage to the catalyst due to incomplete combustion of fuel.
    • Increased load on the starter and battery (especially in winter).

    In the worst case, a piece of electrode may get into the cylinder and cause piston seizure.

    Do I need to lubricate the spark plug threads before installation?

    No, thread lube prohibited manufacturer. It changes the tightening torque and can lead to overtightening. An exception is special anti-seize paste (for example, Liqui Moly Kupfer-Spray), but it is only used on older engines with a risk of thread corrosion.

    How to check spark plugs without special equipment?

    The simplest test is “rearranging the candles.” If the engine stalls, swap the spark plugs from the “problem” cylinder (for example, the 1st) with a known good one (for example, the 4th). If the misfire moves to another cylinder, the spark plug is to blame. You can also visually inspect the candles:

    • 🔴 Red plaque — use of fuel additives with manganese.
    • ⚫ Black dry soot - rich fuel mixture.
    • ⚪ White coating - lean mixture or overheating.
    Is it possible to drive with P0300 (misfire)?

    Short-term - yes, but no more than 200–300 km. Long-term driving with misfires leads to:

    • Overheating of the catalyst and its melting.
    • Fuel getting into the oil (oil dilution and bearing wear).
    • Damage to lambda probes.

    If the error P0300 accompanied by flashing Check Engine, stop immediately and call a tow truck - this is a sign of critical leaks that can lead to a fire in the exhaust.