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Engines and Components› Pistons and Piston Rings
HKS
HKS PISTON FULL KIT FA20 2.1L
SKU: H005 21004-AT002
Advanced — 4+ hours
Overview
Installation maintains the stock bore size, eliminating the need for cylinder liners and associated processes. The components are meticulously analyzed and tested to balance the engine for maximum efficiency and flexibility in setup. This kit is intended for users seeking significant engine internal upgrades to achieve high performance.
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Part #: 21004-AT002
Vehicle Symptoms
- Loss of power during acceleration
- Whistling or siren-like noise from engine bay
- Excessive blue or black smoke from exhaust
- Check engine light illuminated
- Poor fuel economy and sluggish response
Diagnostic Codes
- P0234 – Engine Overboost Condition
- P0236 – Turbocharger/Supercharger Boost Sensor A Range/Performance
- P0237 – Turbocharger/Supercharger Boost Sensor A Circuit Low
- P0238 – Turbocharger/Supercharger Boost Sensor A Circuit High
- P0243 – Turbocharger Wastegate Solenoid A Malfunction
- P1252 – Turbo Boost Pressure Low
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Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | HKS |
| Part Number | H005 21004-AT002 |
Videos
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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