2.5L Naturally Aspirated Engine Complete Assembly for 2019-2022 Mazda

A quick look at your own vehicle makes sure the right engine shows up:

• Verify your VIN's 8th digit is 'L' on the dashboard or driver's door jamb label.
• Confirm your Drivetrain Type (FWD vs. AWD) to determine if you need to transfer the oil pan and brackets.
• Inspect your Cylinder Head on the passenger side to confirm the presence of dual oil control solenoids.
• Check for a Turbocharger under the hood to ensure you do not have the turbo version (VIN Y).

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• Engine hoist/crane with a load leveler
• High-pressure fuel line disconnect tools
• Mazda-specific timing alignment tools (Crankshaft TDC peg SST 49-JE01-061)
• Bi-directional OBD2 scan tool (Mazda MDARS/IDS/M-MDS)

Budget for these consumables at install:

• Fresh OE-spec 0W-20 full synthetic oil
• Genuine Mazda Skyactiv oil filter
• Mazda FL22 pre-diluted long-life coolant
• New genuine Mazda/NGK Iridium spark plugs (PE5R-18-110 or PE5S-18-110)
• Intake manifold gasket
• Exhaust manifold gasket (updated multi-layer steel gasket)
• Front and rear crankshaft main seals
• High-pressure fuel pump O-ring and fuel injector seals
• Valve cover gaskets (if transferring old covers)

What your vehicle’s computers will need after the swap:

What’s involved: Crankshaft Position (CKP) Sensor Relearn, Throttle Body Idle Air Volume Relearn, and Transmission Adaptive Learning

While the engine will physically start and run using your vehicle's original engine computer (PCM), you will likely trigger a check engine light with code P0315 (Crankshaft Position System Variation Not Learned). You must use a high-end diagnostic scan tool (such as Mazda MDARS/M-MDS or equivalent professional bi-directional scanner) to perform the crankshaft sensor calibration and reset the transmission shift adaptives.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• High-Pressure Fuel System Safety: Relieve fuel system pressure before disconnecting lines. High-pressure fuel pipe and injector seals are one-time-use items and must be replaced.
• Crankshaft Position Sensor (CKP) Alignment: If loosened or removed, you must use the specialized alignment tool to set the precise gap and angle relative to the trigger wheel to prevent a no-start or misfire.
• AWD Transfer Case (PTU) Alignment: Be extremely careful when mating the PTU to the transmission and engine block to avoid damaging splines or tearing axle seals.
• Cylinder Deactivation Solenoid Sensitivity: Ensure no dirt or debris enters the oil passages during the swap, and prime the engine with clean oil before starting.
• Fragile Sensors: Plastic sensors and connectors can become brittle with age and heat cycles; handle with care.
• Torque-to-Yield (TTY) Bolts: Critical components like cylinder heads or main bearing caps use single-use TTY bolts that must be replaced if disassembled.

Easy to get right once you know them:

• Ordering for a Non-Cylinder Deactivation Vehicle: Trying to install this engine (VIN L) into a Mazda that originally came with a non-cylinder deactivation 2.5L engine (VIN A or M).
• Reusing Old Gaskets and Seals: Reusing the exhaust manifold gasket or rear main seal, which leads to leaks and potential cylinder head stress.
• Not Transferring the Oil Pan (FWD vs. AWD): Failing to transfer the original oil pan and intermediate shaft brackets when swapping between FWD and AWD configurations.
• Neglecting the Coolant Control Valve (CCV) Update: Installing a used engine without checking or updating the CCV status.
• Improperly Torquing Bolts: Not using a torque wrench or following factory specifications for critical components.
• Not Cleaning Carbon from Intake Ports: Missing the opportunity to clean carbon deposits from the intake ports while the engine is out.

Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer: