Yamaha FI Code 13: Intake Pressure Sensor — Causes & Fix
On Yamaha motorcycles and scooters, FI fault code 13 means an open or short circuit was detected in the intake air pressure (MAP) sensor — the sensor that reads manifold pressure so the ECU can set fueling.
- Applies to
- Yamaha motorcycles
- Est. repair cost
- $20 – $120
- Time to fix
- 30–90 minutes
What it means
Usual causes are a loose/corroded connector, a cracked or disconnected vacuum hose, damaged wiring, or a failed pressure sensor. This is a generic Yamaha fuel-injection (FI) fault code, so it applies across Yamaha FI models — scooters and underbones like the Mio, NMAX, Aerox, and Sniper, plus YZF-R and MT motorcycles. Yamaha shows the code as a number on the diagnostic/odometer display, and the engine-warning light comes on. Once the fault is repaired and the ECU no longer detects it, the code clears; cycling the ignition (or using a Yamaha diagnostic tool) may be needed to confirm.
Symptoms
- FI code 13 with the engine-warning light on
- Rough running or hesitation
- Poor fuel economy
How to fix it
- 1
Inspect the sensor connector and hose
1. Find the intake air pressure sensor on the throttle body/intake. 2. Reseat the connector; check the vacuum hose for cracks or a loose fit.
- 2
Check wiring and replace if needed
1. Test the signal, ground, and reference wires for continuity. 2. Replace the sensor if out of spec, then clear the code.
Frequently asked questions
Is a vacuum hose the usual cause of code 13?
Often yes — a cracked or popped-off hose upsets the pressure reading. Check it before replacing the sensor.
Last updated July 15, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.