Ignition Coil Replacement

Mobile ignition coil replacement at your home or office, with the misfiring cylinder identified before any part is fitted.

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Service Info

Typical Duration 1 hour

We identify the misfiring cylinder from live data and confirm the coil is at fault rather than the plug, injector or wiring, replace the coil and the plug where required, then clear codes and verify the misfire counters have returned to normal.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Mobile Ignition Coil Replacement

An ignition coil takes battery voltage and steps it up to the tens of thousands of volts needed to jump the spark plug gap under compression. Modern engines usually have one coil per cylinder sitting directly on the plug, where they endure constant heat and vibration. When a coil weakens, that cylinder misfires, the engine shakes and the check engine light flashes. Michanic replaces ignition coils at your home or office, after confirming which cylinder is actually at fault.

Why Choose Our Mobile Ignition Coil Replacement Services?

  1. The Right Cylinder Identified:
    A misfire code names a cylinder, not a cause. Swapping the coil to another cylinder to see if the misfire follows is what proves it.
  2. Plugs Checked Together:
    A worn plug with an excessive gap is what kills coils. Replacing the coil without addressing the plug simply repeats the failure.
  3. Flashing Light Taken Seriously:
    A flashing check engine light means an active misfire damaging the catalytic converter. It is not a warning to finish the week with.
  4. At Your Home or Office:
    A misfiring car should not be driven further than necessary, and with us it does not have to be.

Why We are the Best Choice for Mobile Ignition Coil Replacement

  • Proper Diagnosis:
    Live data and a coil swap test confirm the fault before parts are fitted, rather than replacing all the coils and hoping.
  • Related Causes Checked:
    Oil in the plug well, a leaking valve cover gasket or a failing injector all cause misfires that look like a coil fault.
  • Quality Parts:
    Coils are an area where poor quality parts fail quickly. We fit units built to hold up in the heat of an engine bay.
  • Verified Afterwards:
    Codes are cleared and live misfire counters checked to confirm the cylinder is running correctly again.

A misfire is the fault most likely to cause collateral damage while you decide what to do about it. Each time a cylinder fails to fire, its full charge of unburnt fuel goes into the exhaust and ignites in the catalytic converter, where temperatures rise far beyond the design intent. That is why a flashing check engine light means stop rather than continue: a sustained misfire can melt a converter within a short distance. Running on a misfire also washes oil off the cylinder wall, which accelerates bore and ring wear.

Frequently Asked Questions

  • What are the symptoms of a failed ignition coil?
    A misfire on one cylinder, rough idling, a shake felt through the car, hesitation under acceleration, reduced power and a check engine light. If the light is flashing, the misfire is active and damaging the catalytic converter.
  • Should all ignition coils be replaced at once?
    Not usually. Coils fail individually and replacing a full set is expensive. On a very high mileage engine where one has failed and the others are original, doing them together can be sensible, particularly where access is difficult.
  • Can a bad spark plug damage an ignition coil?
    Yes, and it is the most common cause of premature coil failure. A worn plug with a wide gap requires much higher voltage to jump, and the coil works harder every cycle until its insulation breaks down.
  • Why is there oil around my ignition coil?
    Almost always a leaking valve cover gasket letting oil into the spark plug wells. The oil attacks the coil boot and causes it to track to earth rather than fire the plug, so the gasket must be fixed too.
  • Can I drive with a misfiring cylinder?
    Only as far as necessary to get it attended to. A misfire sends unburnt fuel into the catalytic converter, which can overheat and destroy it, and a flashing check engine light specifically indicates that is happening.