2.0L DOHC 4-Cylinder Engine Complete Assembly for 2019-2022 Mazda 3, 3 Sport, CX-30

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

• Verify the 8th digit of the VIN is '7'
• Confirm if the vehicle is Front-Wheel Drive (FWD) or All-Wheel Drive (AWD) to transfer correct brackets/oil pan
• Perform a visual inspection of the intake manifold design and sensor locations

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

Special tools this job needs:

• Engine hoist and load leveler
• 17mm serpentine belt tensioner tool
• Stretch-fit belt installation tool
• High-pressure fuel line disconnect tools
• Mazda-compatible diagnostic scan tool (FORScan, Mazda IDS, or MDARS)

Budget for these consumables at install:

• Engine Oil (approx. 4.4 quarts of premium 0W-20 full synthetic) & Filter
• Engine Coolant (Mazda Genuine FL22 pre-diluted)
• Spark Plugs (Four new Mazda Genuine iridium spark plugs, Part # PE5R-18-110 or PE5S-18-110)
• Intake and exhaust manifold gaskets
• Coolant control valve O-rings and water outlet gaskets (Part # PYFD-15-16Z and PYFB-15-169)
• Front and rear crankshaft main seals
• Main accessory serpentine belt (Gates K060378 or equivalent)
• Water pump stretch-fit belt (Mazda Part # PEDD-15-908 or Gates K030309SF)

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

What’s involved: Security/immobilizer re-marriage, Keep Alive Memory (KAM) & Fuel Trim Reset, PCM Software Updates, and Transmission Initial Learning

The vehicle's immobilizer system is tied to the original engine's electronics. Swapping the engine requires reprogramming the PCM to accept the new unit using Mazda IDS or MDARS. Additionally, fuel trim resets and transmission initial learning are required.

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

• The water pump uses a stretch-fit belt without a tensioner. Use a heavy-duty zip-tie on the water pump pulley and rotate the crankshaft clockwise to walk the belt on safely.
• The direct-injection system operates at up to 2,900+ psi. Relieve fuel system pressure before disconnecting lines and replace high-pressure fuel pipe joints and injector O-rings.
• The plastic Coolant Control Valve (CCV) housing on the back of the cylinder head is fragile and easily cracked during engine removal/installation.
• The crankshaft pulley is keyed, but timing chain alignment marks must align perfectly with colored links on the chain during assembly.
• The vehicle will likely experience a no-start condition until the immobilizer system is reprogrammed.

Easy to get right once you know them:

• Ordering a 2.0L engine from a 3rd-generation Mazda 3 (2014-2018) or CX-3, which has different wiring, sensors, and ECU calibrations.
• Using cheap aftermarket water pump stretch belts (like Dayco 3PK794EE) which are too short and damage water pump bearings.
• Failing to perform professional programming and PCM/immobilizer resets, leading to a no-start condition or immediate trouble codes.
• Reusing old gaskets, fluids, or the rear main seal instead of replacing them during the swap.
• Assuming external accessories like the alternator, starter, and A/C compressor are included.

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: