Parts for your 2012 Honda Stream-Spark plugs

2012 Honda Stream spark plugs: what they do and when to replace them

Yes, the 2012 Honda Stream uses spark plugs. Technical references including the Honda Stream RN6–RN9 service literature and the Honda R18A/R20A engine specifications identify the model as a petrol, spark‑ignition vehicle, and parts catalogues from NGK and Denso list long‑life iridium plugs for these engines. That makes spark plugs absolutely relevant for servicing this model.

On the 1.8‑litre R18A and 2.0‑litre R20A four‑cylinder engines, the spark plugs ignite the air‑fuel mix inside each cylinder. Good plugs help the Stream start crisply, idle smoothly, pull cleanly under load, and keep fuel use and emissions in check. Worn or fouled plugs make the car harder to start, feel doughy on hills, and can nudge the check‑engine light on with misfire codes.

For regular servicing, most Australian and New Zealand schedules for Honda’s iridium plugs suggest replacement about every 100,000–120,000 km or 6–8 years, whichever comes first. Short‑trip, dusty, or high‑heat use can justify earlier change‑outs. It’s smart to inspect them around 50,000–60,000 km and replace sooner if the electrodes are eroded, glazed, or the insulator is cracked.

• Typical gap: 1.0–1.1 mm (pre‑set on quality iridium plugs, avoid re‑gapping if possible).
• Torque: roughly 18–22 N·m on an alloy head, always confirm with engine‑specific data.
• Fit only the correct heat range and design specified for R18A or R20A engines.

When replacing, work on a cool engine, blow out plug wells, and start each plug by hand to avoid cross‑threading. Modern plated‑shell plugs generally don’t need anti‑seize, using it can lead to over‑torque. A tiny dab of dielectric grease on the coil boots helps future removal. Because the Stream uses coil‑on‑plug ignition, check each coil boot for cracking and look for oil in the plug tubes—if present, the rocker cover tube seals may need attention.

Sticking with OEM‑equivalent iridium plugs from recognised brands keeps the ignition system happy for the long haul. Four fresh plugs, installed properly and on time, make a noticeable difference to how a 2012 Honda Stream drives day‑to‑day.

FAQs

What spark plug type and gap does a 2012 Honda Stream use?
The 2012 Stream with R18A or R20A engines is designed for long‑life iridium plugs in the correct Honda‑specified heat range. The typical gap is 1.0–1.1 mm and quality iridium plugs are supplied pre‑gapped, avoid forcing the gap smaller or larger. Always match the exact spec to the engine code and local service data.

How often should the spark plugs be replaced in Australia or New Zealand?
For iridium plugs, plan on about 100,000–120,000 km or 6–8 years. If the Stream does lots of short trips, idles frequently, or tows, earlier replacement can be wise. Copper or standard nickel plugs (if fitted) need much shorter intervals, often 30,000–40,000 km.

What torque should be used, and is anti‑seize recommended?
Aim for around 18–22 N·m on these alloy heads, but confirm with engine‑specific data. Most modern plugs have a nickel or zinc‑plated shell and don’t require anti‑seize, using it can reduce friction so much that the threads over‑stretch. If anti‑seize is ever used, reduce final torque accordingly and proceed with care.