Ignition Coil and Iridium Spark Plugs for Toyota Avalon (2019-2021) 2.5L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2019-2021 Toyota Avalon

Restores combustion efficiency and eliminates cylinder misfires: This direct-fit ignition service kit replaces degraded coil-on-plug packs and worn spark plugs on the 2.5L Dynamic Force engine to ensure precise ignition timing under high thermal loads.

The Stock Avalon Ignition Breakdown

Factory ignition coils operating on the high-compression (14.0:1) A25A engine endure extreme thermal cycling in modern hybrid engine bays. Over time, OEM coil boots develop micro-fissures and dielectric breakdown within the internal epoxy potting. This creates secondary voltage leaks, carbon tracking, and intermittent misfire codes (P0300-P0304). Concurrently, standard spark plug electrodes erode, widening the gap and overworking the primary coil windings, leading to rough cold starts, degraded fuel economy, and erratic idle transitions.

The Engineering Solution

This ignition assembly features high-conductivity copper primary and secondary windings housed within reinforced thermoplastic and potted in high-dielectric epoxy to resist thermal degradation and internal flashover. Paired with four fine-wire iridium spark plugs, the kit delivers focused spark energy with minimal voltage demand. The high-melting-point iridium center electrode resists erosion under lean-burn conditions, restoring factory throttle response, idle stability, and combustion efficiency.

Technical Specifications

Compatibility

• 2019 Toyota Avalon (Hybrid XLE, Hybrid Limited, Hybrid XSE) 2.5L L4
• 2020 Toyota Avalon (Hybrid XLE, Hybrid Limited, Hybrid XSE) 2.5L L4
• 2021 Toyota Avalon (Hybrid XLE, Hybrid Limited, Hybrid XSE) 2.5L L4

The Toyota Reliability Standard

Engineered to precise OEM resistance and output tolerances, these direct-fit components utilize factory blade-style electrical connectors for plug-and-play installation without causing ECU calibration errors or check engine lights.