Repair Cost Guide

Spark plugs replacement cost
for a Subaru Outback

Replacing the spark plugs on a Subaru Outback involves accessing the horizontally-opposed engine, which often requires removing the intake manifold or other components on some model years. The primary cost drivers are the price of high-quality iridium or platinum plugs required for the Boxer engine and the increased labour time due to the engine's unique layout.

$200 – $350
Typical fair price range · USD

Cost breakdown

Parts: ~$60-$120 / Labour: ~$140-$230

What affects the price

Engine type (e.g., 4-cylinder vs. 6-cylinder H6)
Model year and engine access complexity
Quality of spark plugs (standard vs. long-life iridium)

Can you do it yourself?

Possible with skill — requires patience, proper tools, and knowledge of the Boxer engine layout. Removing the intake manifold on some models is a significant hurdle.

Tips before you pay

Use only OEM-specified iridium or platinum plugs to avoid misfires and ensure longevity.
Replace the ignition coil boots at the same time if they show signs of cracking or wear.
Gap the plugs correctly before installation, as pre-gapped plugs can sometimes be off-spec.

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More cost guides

Brake pads replacement — Subaru Outback Alternator replacement — Subaru Outback Timing belt replacement — Subaru Outback

Estimate based on typical U.S. market rates as of July 2026. Actual prices vary by region, shop, and parts quality — always compare against a real quote using our Scam Checker.