Repair cost guidesAUSTRALIAN REPAIR COST GUIDE

Spark Plug Replacement Cost in Australia

The number and type of plugs matter, but access is often the largest labour variable. Some engines require intake components to be removed before the plugs can be reached.

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Published by David Burridge, ShiftyMechanics founder and editor. Model data dated 9 October 2026. Guide content updated 16 October 2026. How estimates work.

Model-based vehicle example

Spark Plug Replacement

2017 Honda Civic · Australia

$287–$486

Parts$109–$202

Approx. labour1.36–1.78 hours

Model-based guide awaiting source-by-source review. It is not a verified vehicle-specific quote; confirm parts, job scope and local workshop pricing. Replace petrol-engine spark plugs Confirm the repair scope and exact vehicle specification.

Signs to investigate

Engine misfire or rough idle
Poor fuel economy
Hard starting
Reduced acceleration or a check-engine light

What changes the price?

Number of cylinders
Copper, platinum or iridium plugs
Engine access and intake removal
Whether coils or seals also need attention

Questions to ask the workshop

What plug type and service interval apply?
How many plugs are included?
Does access require removing the intake manifold?
Has the misfire been diagnosed rather than assumed?

WHAT THE JOB INVOLVES

Understand the repair scope

The correct plug specification and replacement interval are confirmed for the exact engine, including heat range, thread reach and electrode type.

Ignition coils and any intake components blocking access are removed, debris is kept out of the plug wells, and the old plugs are examined for unusual deposits or wear.

New plugs are installed to the specified torque, coils and seals are refitted, and the engine is checked for smooth running and stored misfire faults.

Checks that should support the diagnosis

A symptom alone does not prove a part has failed. Before authorising work, ask what inspection or test led to the recommendation.

Scan for cylinder-specific misfire codes and freeze-frame data
Inspect coils, plug wells and boots for oil, coolant or tracking
Check removed plug condition and compare cylinders
Confirm the symptom is not caused by fuel, compression or wiring faults

What a comparable quote normally includes

Compare like with like. A lower quote may simply cover less of the job.

A complete set of correctly specified spark plugs
Removal and refitting of ignition coils
Basic visual inspection of accessible coil boots and plug wells
Clearing and rechecking relevant fault codes

Possible extra work

These items are not automatically required, but they can change the bill when inspection shows they are needed.

Intake-manifold gasket where access requires removal
Ignition coils or damaged coil boots
Rocker-cover or plug-tube seals
Thread repair if a plug hole is damaged

COMMON QUESTIONS

Understand the quote before agreeing

How much does spark plug replacement cost in Australia?

For the 2017 Honda Civic example shown, ShiftyMechanics estimates $287–$486. Exact parts and the workshop's actual labour rate can change the result.

Does the estimate include parts and labour?

Yes. Most jobs show modelled parts, labour and rates separately. Published supplied-and-fitted examples include installation in the advertised price. They do not provide a separate parts/labour breakdown; confirm tax, fees and fitment with the supplier.

What should a spark plugs quote explain?

A useful written quote should identify the repair scope, the main parts being supplied, the expected labour and any likely additional work. For this job, common inclusions are a complete set of correctly specified spark plugs, removal and refitting of ignition coils, basic visual inspection of accessible coil boots and plug wells.

Have a quote in front of you?

Choose your car and repair to review available price references, their scope and any remaining model assumptions.

Check the estimate