How to Replace Spark Plugs — 2020-2025 Hyundai Sonata

Replacing spark plugs on your 2020-2025 Hyundai Sonata is a key maintenance task to ensure smooth engine performance, especially if you're noticing rough idling, misfires, or reduced fuel economy, or if you've hit the 60,000-95,000 mile interval. This DIY repair can save you big, costing just $40-$80 for parts compared to $150-$250 at a shop. With the right tools and this guide, most DIYers can tackle this job confidently in under two hours. DIY Cost: $40-$80 | Shop Cost: $150-$250

You’re done. Clear any stored codes with your scanner and complete a normal drive cycle so the vehicle’s readiness monitors reset.

If the code returns, the root cause likely wasn’t the part you replaced — go back through the diagnostic steps before swapping anything else.