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DTC codes / Nissan codes / P1206

P1206 · NissanCylinder 6 Misfire

P1206 on Nissan vehicles indicates that the engine control module has detected a misfire event specifically on cylinder number 6, typically by monitoring crankshaft speed fluctuations that deviate from the expected firing pattern. The code is stored once the misfire counter for that cylinder exceeds a calibrated threshold, which may be accompanied by a flashing check engine light if the misfire is severe enough to damage the catalytic converter.

SystemPowertrain
Code typeNissan specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Check engine light illuminated, often steady but sometimes flashing under load if the misfire is severe
  • Noticeable engine vibration or shaking at idle that may smooth out at higher RPM
  • Rough running or hesitation during acceleration, particularly when climbing hills or merging
  • A distinct rhythmic shudder or popping sound from the exhaust that matches the misfire frequency
  • Often no symptoms besides the warning light when the misfire is intermittent or mild
  • Reduced fuel economy and a faint raw fuel smell from the tailpipe in more advanced cases

Common causes, most likely first

  1. Worn or fouled spark plug on cylinder 6, especially common on Nissan engines with high mileage or extended service intervals
  2. Failed ignition coil or coil-on-plug boot for cylinder 6, which is a frequent failure point on Nissan V6 and four-cylinder engines
  3. Faulty fuel injector for cylinder 6, either clogged, leaking, or electrically open, causing an imbalance in fuel delivery
  4. Vacuum leak at the intake manifold runner or gasket near cylinder 6, leaning out that specific cylinder
  5. Low compression on cylinder 6 due to worn piston rings, valve seat recession, or a head gasket issue
  6. Damaged or chafed wiring to the cylinder 6 ignition coil or injector, often from heat exposure or rodent damage
  7. Mechanical valvetrain fault such as a collapsed lifter or worn cam lobe affecting cylinder 6 breathing

How to diagnose and fix it

  1. Perform a visual inspection of the cylinder 6 ignition coil, spark plug, and injector connector for obvious damage, oil fouling, or loose connections
  2. Swap the cylinder 6 ignition coil with a known-good coil from another cylinder and clear the code to see if the misfire follows the coil
  3. Remove and inspect the cylinder 6 spark plug for wear, gap, or fouling, and replace it if the electrode is rounded or the insulator is cracked
  4. Run a relative compression test or a cylinder leak-down test on cylinder 6 to rule out mechanical failure before replacing electrical parts
  5. Use a noid light or oscilloscope to check the injector pulse signal at cylinder 6, and perform an injector balance test if the electrical signal is present
  6. Smoke-test the intake system to check for vacuum leaks near the cylinder 6 runner, and repair any cracked gaskets or hoses
  7. If all electrical and fuel checks pass, perform a crankshaft position variation relearn or inspect the reluctor wheel for debris that could skew misfire detection

What Nissan Techs Check Before Swapping Parts

  • A P1206 on Nissan engines is often set by a coil that tests fine with a simple resistance check but breaks down under heat and load, so swapping the coil to another cylinder is more reliable than bench-testing it
  • Nissan V6 engines in particular are known for ignition coil failures that migrate, and a misfire on cylinder 6 can sometimes be caused by a coil that was previously replaced with an aftermarket unit of marginal quality
  • A dirty or failing mass airflow sensor can cause a lean condition that affects cylinder 6 first because of intake runner design, so check fuel trims before condemning the injector
  • The code does not always mean the spark plug or coil is at fault; a sticking exhaust valve or a failing valve spring on cylinder 6 can produce a misfire that only shows up at certain RPM ranges
  • After repairing the misfire, the check engine light may remain on for several drive cycles until the misfire monitor completes, so do not assume the repair failed if the light does not clear immediately

Can I keep driving with P1206?

You can drive short distances at low speed to a repair shop if the check engine light is steady, but avoid heavy acceleration and highway driving. If the light is flashing, stop driving immediately because a severe misfire can overheat and destroy the catalytic converter within minutes.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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