CARFIX

NGK Platinum Spark Plug

NGK Spark Plugs — NGK Platinum Spark Plug — part number PTR5A-10

NGK Spark Plugs · Part number PTR5A-10 · NZ$58.19 incl. GST

For your trusty Ford Focus or Mondeo, especially those European-engineered daily drivers, spark plugs are the unsung heroes of your engine, delivering that crucial spark for combustion, which means better fuel economy, a smooth idle, and no dramas starting up on a chilly Kiwi morning. The NGK option we've got here is a top-notch, OE-quality choice, sitting pretty.

Price

NZ$58.19 including GST. Part number PTR5A-10.

Fits these vehicles

Description

Give Your Ford Focus or Mondeo a Spark of Life with Fresh Plugs! (NGK Edition)
> Spark plugs are like the tiny lighters in your engine's cylinders, creating that essential spark to get the air-fuel mix roaring. But, over time, those little sparkers get tired, their electrodes wear down, and carbon builds up, leading to misfires, rough running, and extra emissions – especially if you've got one of those classic 1.6L or 2.0L Zetec engines in a late 90s to mid-2000s Ford Focus or Mondeo. Time for an upgrade, mate!

Symptoms That Led You Here
• Engine misfires or stuttering under acceleration
• Rough or lumpy idle, especially when cold
• Noticeably worse fuel economy than usual
• Difficulty starting on frosty NZ mornings
• Check engine light illuminated (often P0300-P0304 misfire codes)
• Failed emissions test or visible black exhaust smoke

Will it pass WOF?
Yes, spark plugs themselves aren't a direct WOF inspection item. However, worn plugs cause excessive exhaust emissions and can trigger warning lights—both of which will fail your Warrant of Fitness. Replacing degraded plugs restores clean combustion and ensures your Focus or Mondeo sails through the emissions check.

DIY or Workshop?
Difficulty: 4/10
Time: 30-60 minutes
Tools Required: 10mm socket, spark plug socket (16mm for most Zetec engines), torque wrench, extension bar, dielectric grease

The inline-four layout in Focus and Mondeo models provides reasonable access to all four plugs. Remove the coil pack or HT leads, extract old plugs, gap new plugs to spec (typically 1.0-1.1mm for these engines), and torque to 20-25 Nm. Avoid cross-threading the aluminium head.

Expert Recommendation
Bob @ CARFIX recommends replacing spark plugs every 30,000-40,000 km for standard copper-core plugs, or up to 100,000 km for iridium/platinum variants. The NGK SKU PTR5A-10 is an excellent OE-equivalent choice that delivers reliable ignition performance for your Ford's Zetec engine. Bob @ CARFIX is always on hand to help you work out exactly what spark plug spec suits your Focus or Mondeo. Make sure you head over to Bob's Shop for a chat!

Fitment Notes
• Confirmed fitment for Ford Focus 1.6L/2.0L 16V (1998-2005) including ST170 variants
• Suits Ford Mondeo 1.6L/1.8L/2.0L 16V (1993-2000)
• Also fits Morgan Four/Four 1.8L Zetec-powered models (1999-2002)
• Always verify electrode gap specification against your vehicle's service manual
• ST170 models may benefit from colder heat-range plugs if modified

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🛠️ Bob's Pro Tip: Do the Job Right!
> If you're replacing this spark plug, make sure you've got the right workshop prep, protection, and safety gear ready. Taking a bit of extra time and using the proper safety stands and cleaners makes all the difference for a professional result!

🧰 What Else You'll Need:
• Safety First: Always secure your vehicle on heavy-duty safety jack stands before working underneath. Never rely solely on a hydraulic jack.
• Clean Hands: Keep a pack of Nitrile Gloves handy to protect your skin from grease, oils, and chemical sprays.
• Preparation: Have microfibre towels and a suitable parts cleaner nearby to keep components clean during installation.