Nissan Micra is a compact hatchback that is valued for its efficiency and reliability, but even it has its weak points. One of them is spark plugs, which many owners change too late or choose unsuitable analogues. In this article we will look at which spark plugs are installed on Micra K13 (2010–2017) and K14 (2017–present), how to replace them correctly and why cheap analogues can result in coil repairs.

We analyzed data from forums Nissan Club Russia, service manuals and owner reviews to collect up-to-date information. There are no general phrases here - only specific articles, step-by-step instructions and warnings about common mistakes that even experienced drivers make.

What spark plugs are installed on the Nissan Micra from the factory?

On Nissan Micra K13 (with engines HR12DE And HR15DE) and K14 (with HR12DDR for the hybrid version) spark plugs are used by the installer NGK IFR6T11 (article 22401-JM01B) or their analogues from Denso — FK16HR11 (K16HR-U11). These models comply with the standard iridium spark plugs with a thin central electrode (0.6 mm), which ensures stable sparking and reduces fuel consumption.

Important: on hybrid versions Micra K14 (for example, with a system Nissan Intelligent Dual Clutch) spark plugs with a different heat rating can be installed - NGK IFR7T11 (22401-4M015). Check the article by the VIN code or sticker under the hood!

  • 🔧 Original articles:
    • NGK IFR6T11 (22401-JM01B) - for K13 with HR12DE/HR15DE;
    • Denso FK16HR11 (K16HR-U11) - complete analogue;
    • NGK IFR7T11 (22401-4M015) - for hybrid K14.
  • ⚠️ What happens if you put the wrong candles?
    • Candles with wrong heat number (for example, "hot" instead of "cold") will lead to detonation and damage to the pistons;
    • Cheap nickel analogues will last 2–3 times less than iridium (20–30 thousand km versus 100 thousand km);
    • Candles with unsuitable clearance (not 1.1 mm) will cause misfire and error P0300.
📊 What spark plugs do you use in your Nissan Micra?
  • Original NGK/Denso
  • Analogues (Bosch, Beru, Champion)
  • I don't know which ones are worth
  • I change it according to the recommendation of the service

Signs of spark plug wear: when is it time to change

The manufacturer recommends replacing spark plugs with Nissan Micra every 100,000 km for iridium and 30,000 km for nickel. However, in Russian conditions (bad fuel, frequent cold starts), this interval is reduced by 20–30%. Pay attention to the following symptoms:

  • ⚡ Engine tripping — especially noticeable at idle or during acceleration;
  • 🛢️ Increased fuel consumption (by 10–15%) due to inefficient combustion of the mixture;
  • 🚗 Dips when accelerating — the engine “stalls” when you press the gas;
  • 🔥 Black or white soot on the electrodes (visible upon visual inspection);
  • 💡 Check Engine with errors P0300–P0304 (misfire).

Critical point: if traces of oil or gasoline are found on the spark plugs, the problem is not in them, but in worn valve stem seals or faulty injectors. Replacing spark plugs will not help here - engine diagnostics are required.

What to do if the candles are “flooded” with gasoline?

If the spark plugs are filled with fuel (for example, after several unsuccessful starts in winter), they can be dried:

1. Unscrew the spark plugs and wipe the electrodes with a lint-free cloth.

2. Heat them on a gas stove (no more than 2-3 minutes!) or with a hairdryer.

3. Crank the starter without spark plugs for 5–10 seconds to remove excess gasoline from the cylinders.

4. Install dry spark plugs and start again.

If the problem persists, check coolant temperature sensor or idle air control.

Step-by-step instructions for replacing spark plugs on a Nissan Micra

Replacing spark plugs with Micra K13/K14 does not require a special tool, but there are some nuances. For example, on the engine HR12DE access to the spark plugs of the 2nd and 3rd cylinders is difficult - you will need to remove intake manifold or use extended spark plug wrench with cardan.

What you will need:

  • 🔧 16 mm spark plug wrench (preferably with a magnet or rubber seal);
  • 🔩 10 mm socket wrench (for removing ignition coils);
  • 🧲 Torque wrench (optional, but recommended for precise tightening);
  • 🧴Dielectric grease (e.g. Liqui Moly Silber-Fett).

Remove the negative terminal from the battery|Clean the area around the spark plug wells with compressed air|Mark the high-voltage wires (if removing the coils)|Check the gap of the new spark plugs (should be 1.1 mm)|Wear dielectric gloves (optional, for safety)-->

Sequence of actions:

  1. Open the hood and remove decorative engine cover (on K13 it is secured with 4 latches).

  2. Disconnect the connectors from ignition coils (press the lock and pull up).

  3. Unscrew the coil mounting bolts with a 10 mm wrench and carefully remove the coils. Don't pull the wires!

  4. Using a spark plug wrench, remove the old spark plugs. If they get stuck, use WD-40 and let stand for 10-15 minutes.

  5. Install new spark plugs, first applying a thin layer of dielectric grease to the threads. Tighten to 20–25 Nm (no torque wrench - hand tighten + 1/4 turn).

  6. Reassemble everything in reverse order. After replacement, reset errors Check Engine (if they were) using a scanner or disconnecting the battery terminal for 10 minutes.

💡

If you hear a crunching sound when unscrewing the spark plug or it is tight, stop immediately! Most likely, the thread is stuck or damaged. In this case, it is better to contact a service center so as not to tear off the cylinder head.

Top 5 mistakes when replacing spark plugs on a Micra (and how to avoid them)

Even experienced car owners make mistakes that lead to thread damage, coil breakdowns or misfires. Here are the most common:

Error Consequences How to avoid
Tightening spark plugs without a torque wrench Thread failure in the cylinder head or shortness (misfire) Use a torque wrench (20–25 Nm) or hand tighten + 1/4 turn
Installing spark plugs with unchecked gap Errors P0300–P0304, unstable engine operation Check the gap with a feeler gauge (should be 1.1 mm). Iridium spark plugs usually do not require adjustment
Using nickel spark plugs instead of iridium spark plugs Reduced service life by 3 times, increased fuel consumption For HR12DE/HR15DE Only iridium spark plugs with article number are suitable IFR6T11 or FK16HR11
Dirt getting into spark plug wells Short circuit of coils, insulation breakdowns Blow out the wells with compressed air before removing the spark plugs
Mixed up high voltage wires Cylinder errors, uneven engine operation Mark wires or photograph their location before removing
⚠️ Attention: If after replacing the spark plugs the engine begins to run worse, check coil connection sequence. On Micra K13 cylinders are numbered from right to left (if you look at the engine from the hood).

Analogues of original candles: what to choose and what to avoid

Original candles NGK IFR6T11 or Denso FK16HR11 cost from 800 to 1,200 rubles per piece, which seems expensive to many. However, cheap analogues can be even more expensive due to coil breakdowns (the price of a new reel is from 5,000 rubles). If you still want to save money, choose proven brands:

  • 🔥 Premium analogues (iridium/platinum):
    • Bosch FR7DPX (0 242 236 666) - a complete analogue of NGK, but with platinum coating;
    • Champion OE201/T10 - suitable for HR12DE, but the resource is lower (up to 80 thousand km);
    • Beru Z323 (14FR-7DU) - German quality, but difficult to find in stores.
  • ⚠️ Budget analogues (nickel):
    • Brisk DR15YC - cheap, but lasts for a maximum of 20 thousand km;
    • Autolite XP5224 - suitable for temporary replacement, but not for permanent use;
    • Ween 121-1370 - often counterfeited, buy only from authorized dealers.

What to avoid:

  • 🚫 Candles with copper core — they overheat and fail within 10–15 thousand km;
  • 🚫 Counterfeit brands NGK or Denso — characterized by low-quality ceramics and rapid wear;
  • 🚫 Candles with non-standard heat rating (for example, “hot” spark plugs for tuned engines).
💡

Iridium spark plugs will pay for themselves due to fuel savings (up to 5%) and durability. Nickel analogues will be cheaper to purchase, but they will need to be replaced 3-4 times more often.

Frequently asked questions about spark plugs on Nissan Micra

Is it possible to use platinum spark plugs instead of iridium spark plugs?

Yes, but only if their parameters (heat rating, gap, thermal range) match the original. For example, Bosch FR7DPX - a worthy alternative NGK IFR6T11. However, platinum is less resistant to erosion, so the service life of such candles is 10–15% less.

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

In case of critical wear of spark plugs:

  • Will increase load on ignition coils (they may burn);
  • will appear detonationwhich destroys pistons and rings;
  • The engine will start "triple" even when hot, but an error P0300 will become permanent;
  • Fuel consumption will increase by 15–20%.

In practice, suppositories rarely “die” suddenly - usually the symptoms increase gradually.

Do I need to adjust the gap on new iridium spark plugs?

No, iridium spark plugs (eg NGK IFR6T11) are supplied with a preset gap 1.1 mm. Adjustment may damage the thin center electrode. An exception is if the candles were stored in unsealed packaging or were mechanically damaged.

Why does the engine run unstably after replacing the spark plugs?

Possible reasons:

  • Confused high voltage wires (check the order of connecting the coils);
  • Incorrect gap on candles (should be 1.1 mm);
  • Hit oil or dirt into candle wells;
  • Malfunction ignition coils (check the resistance with a multimeter).

If the problem persists, check compression in cylinders and injector condition.

Can old candles be cleaned and reused?

Theoretically yes, but:

  • Iridium spark plugs will not last long after cleaning - the iridium coating wears off;
  • Nickel spark plugs can be cleaned sandblaster or ultrasound, but their resource will still be lower than new ones;
  • If there are any on the candles cracks or melting, they definitely need to be replaced.

Cleaning only makes sense as a temporary measure (for example, while traveling).

Conclusion: which spark plugs to choose and how to extend their service life

For Nissan Micra K13/K14 optimal choice - original iridium spark plugs NGK IFR6T11 or Denso FK16HR11. They ensure stable engine operation, fuel economy and a service life of up to 100 thousand km. If your budget is limited, consider platinum analogues from Bosch or Champion, but avoid nickel plugs - they won't be worth the savings.

To extend the life of candles:

  • 🛢️ Refuel at proven gas stations (bad gasoline accelerates the formation of soot);
  • 🔧 Follow condition of the ignition coils — breakdowns accelerate the wear of spark plugs;
  • 🚗 Avoid short trips in winter (the engine does not warm up, the spark plugs become overgrown with soot);
  • 🔥 Check regularly (every 20 thousand km) gap and the condition of the electrodes.

If after replacing the spark plugs the problems remain, do not attribute everything to a “defect”. More often than not they are to blame ignition coils, injectors or oxygen sensor. In this case, only comprehensive diagnostics will help.