• Plug in your OBD2 scanner
• Turn ignition ON
• Start engine (recommended for accurate values)

Using Thinkdiag2:

BMW → Special Functions → Smooth Running Control

• Values are often NOT in standard live data
• You must go through Special Functions

• Tool may ask to check or clear fault codes
• Confirm and continue

• Select Show values

You will now see:

• Injector correction values (mg/stroke)
• One value per cylinder

Typical reading example:

• Cylinder 1: +0.5
• Cylinder 2: -0.8
• Cylinder 3: +0.3
• Cylinder 4: -0.2

👉 Ideal values:

• Close to 0 mg/stroke

• ±1 mg/stroke → excellent
• ±2 mg/stroke → acceptable
• ±3–4 mg/stroke → warning zone

• Lightly rev engine (1500–2500 RPM)
• Observe changes

👉 Healthy injectors:

• Values remain stable
• Stay close to zero

Combine scanner data with:

• Smooth idle
• Smooth driving
• No misfires