P51K18881A / 2797008662 / PEER188k2B Mazda 3 Sport 2015 Engine Control Unit ECU.

Product Description
This OEM Engine Control Unit (ECU) with part number P51K-18-881A (also referenced as P51K18881A / 2797008662) is designed for the Mazda 3 Sport / Hatchback (2014–2016 generation) equipped with the appropriate petrol engine. Multiple remanufactured listings confirm that this unit is suitable for the 2015 model year and certain engine variants.

The ECU oversees fuel injection, ignition timing, sensor feedback, emission controls, and diagnostics. Before installing a replacement, verify the following:

Confirm your existing ECU part number is an exact match (P51K-18-881A or P51K18881A)
Ensure engine variant, transmission type, and wiring harness layout are compatible
In many cases the replacement unit will need to be programmed or adapted to your vehicle’s VIN and immobiliser system
Used units should be tested and verified for correct function (no internal faults, correct software/hardware version, good condition)

Compatibility Table

Vehicle Make	Model	Year	Engine Variant	ECU Part Number(s)	Notes
Mazda	Mazda 3	~2014-2016	Petrol (e.g., 2.0L SkyActiv or compatible)	P51K-18-881A / P51K18881A / 2797008662	Used listings cite this exact part number for 2015 model year.

Important Notes & Buyer Tips

Match the part number exactly—even small variations can lead to incompatibility.
Replacement ECUs often need programming/adaptation (especially VIN/immobiliser). Some sellers provide “plug & play,” but confirm details. Verify condition of the ECU: check connectors, pins, signs of damage or corrosion.
After installation: clear fault codes, verify engine starts and idles correctly, scan for any remaining faults.
Request pictures of the unit label, part number and hardware/software version before purchase.

Compatibility Table

Vehicle Make	Model	Year	Engine Variant	ECU Part Number(s)	Notes
Mazda	Mazda 3	~2014-2016	Petrol (e.g., 2.0L SkyActiv or compatible)	P51K-18-881A / P51K18881A / 2797008662	Used listings cite this exact part number for 2015 model year.

Shipping, returns and warranty

Worldwide shipping with tracking
30-day returns on unused, uninstalled parts
90-day limited warranty against defects

Send us your VIN and we confirm fitment before shipping. See our shipping policy and return policy.

P51K18881A

P51K18881A Mazda 3 Sport Engine Control Unit ECU 2797008662