UF247 Ignition Coils and 4503 Spark Plugs Compatible with Toyota

Our review of the UF247 Ignition Coils and 4503 Spark Plugs looks at this paired replacement kit for 1.8L four-cylinder engines. The bottom line: this kit is best for owners of Toyota Celica, Corolla, Matrix, MR2 Spyder, Pontiac Vibe and Chevrolet Prizm who need a straightforward, OE-level coil and iridium spark plug swap that restores reliable starting and reduces misfires. It stands out because the coils use heavy-duty materials and the plugs use an iridium electrode, which together deliver improved cold-start performance and smooth running without a high price or complicated installation.

Key Features

• Direct fitment: Designed for multiple 1.8L L4 models so buyers can expect a direct replacement for original coil packs and spark plugs without major modifications.
• Durable coil construction: Coil packs use silicon steel, Japan-imported rubber and Germany-varnished wire to resist heat and extend service life.
• Iridium spark plugs: The 4503 spark plugs use an iridium electrode and specialized ceramic for quicker starts and responsive acceleration.
• OE-level compatibility: Listed to match several OE numbers so mechanics can verify fit and avoid ordering the wrong part.
• Misfire prevention: Built to avoid misfire after testing and to maintain smooth idle and fuel economy over many miles.

Who It's For

This kit is aimed at DIYers and independent shops replacing worn ignition coils and plugs on Toyota Celica (2000-2005), Corolla (1999-2008), Matrix (2003-2008), MR2 Spyder (2000-2005) and companion models Pontiac Vibe and Chevrolet Prizm with the 1.8L L4 engine. It is especially appropriate for owners who want a cost-effective alternative to dealer parts while keeping OE-level durability and materials.

Those who should look elsewhere include drivers with engines outside the listed model years or non-1.8L engines, and anyone who requires factory-branded parts for warranty or dealership service reasons. Also confirm OE cross-reference numbers before ordering to ensure a proper electrical connector match.

Pros & Cons

Pros

• Quality materials in coils help resist heat and provide long service life.
• Iridium plugs offer improved cold starts and stronger throttle response.
• Generally straightforward installation and good value compared to OEM pricing.

Cons

• Some users reported occasional issues with plug connector fit, so OE verification is recommended.

Specifications

Product type	Ignition coils and spark plugs kit
Compatible engines	1.8L L4
Fitment highlights	Toyota Celica, Corolla, Matrix, MR2 Spyder; Pontiac Vibe; Chevrolet Prizm
Spark plug type	Iridium electrode, ceramic insulator
Coil materials	Silicon steel, Japan-imported rubber, Germany-varnished wire
OE cross references	UF247, UF315, C1249 and other listed OE numbers

Our Verdict

The UF247 coils and 4503 iridium spark plugs are a sensible replacement package for owners of compatible 1.8L Toyota-family vehicles who want reliable starting, fewer misfires and durable coil construction at a competitive price. Confirm OE fitment for the electrical connector before ordering, but for the right models this kit restores drivability and offers strong value compared with dealer parts.

Frequently Asked Questions

Will these coils and plugs fit my Corolla?
They fit Corolla models with the 1.8L L4 listed in the product fitment (1999-2008); verify OE cross numbers to be certain.

Are the spark plugs a direct replacement?
Yes, the 4503 plugs use an iridium electrode and are intended as direct replacements for the listed OE numbers.

How long will the coils last?
Coils are built with durable materials and are reported to perform well beyond initial miles; regular inspection is still recommended.