Genuine Subaru 13021AA141 Crankshaft Timing Sprocket – EJ Engines

Genuine Subaru 13021AA141 Crankshaft Timing Sprocket

This is the toothed sprocket pressed onto the crankshaft nose that drives the timing belt on Subaru EJ-series boxer engines, keeping the camshafts synchronized with the crankshaft. It also carries the trigger pattern read by the crankshaft position sensor.

Worn or damaged sprocket teeth — or a cracked trigger ring — can cause timing-belt misalignment, crank-sensor misfire codes, rough running or a no-start. Standard practice is to inspect the sprocket at every timing-belt change (the EJ belt interval is 105,000 miles) and replace it if there is any visible wear.

Part Number

• 13021AA141 (Genuine Subaru; catalog name “SPROCKET-CRANKSHAFT”)

When to Replace — Common Symptoms

• Crankshaft position sensor codes / misfires
• Rough running after a timing-belt job
• Visible wear, cracks or damaged teeth at belt service
• No-start with erratic crank signal

Product Highlights

• Genuine Subaru part — exact OE geometry and trigger pattern
• Steel construction
• Direct fit on EJ-series crankshaft nose
• Sensible insurance during a 105k-mile timing-belt service

Condition

New, Genuine Subaru part

Product Type

Engine timing — crankshaft sprocket (timing belt drive)

Function

Drives the timing belt from the crankshaft and provides the rotation signal pattern for the crankshaft position sensor.

Compatible Vehicles

Important: verify by VIN before ordering. FA/FB-series engines (timing chain) do not use this part.

Package Contents

• 1 × Genuine Subaru 13021AA141 crankshaft sprocket

Technical Specifications

Warranty

Manufacturer warranty may vary by supplier and region. Contact us before purchase if warranty confirmation is required.

FAQ

Is this the camshaft or crankshaft sprocket?

Crankshaft. Subaru catalogs list 13021AA141 as “SPROCKET-CRANKSHAFT”.

When should I replace it?

Inspect at every timing-belt service (105,000-mile interval on EJ engines); replace if teeth or the trigger ring show wear or damage.

Will it fit my 2016 WRX STI?

Yes — the STI kept the EJ25 engine through 2021. The 2015+ base WRX with the FA20 (timing chain) does not use this part. Verify by VIN.

Do I need special tools?

Replacement happens during timing-belt service; if you are doing the belt yourself, no extra tools are needed beyond the belt job itself.