C1276Irregular signal from the front left wheel-speed sensor (test mode)

• Toyota/Lexus code · ABS / stability control
• Lights a warning lamp

How the car detects it

During the sensor check the front left wheel-speed signal changed abnormally. This is a test-mode code: it only appears during the sensor check a workshop runs with a scan tool.

What you may notice

• ABS warning light blinks in test mode

Likely causes

• PossibleDamaged or dirty tone ring
• PossibleSensor installation
• RareSensor or wiring

Sources

• share.qclt.com › 0370010.pdf
• purefjcruiser.com › 0280012.pdf
• toyota-club.net › br_vsc.htm

Backed by at least two independent sources.

From Obdaryn's Toyota/Lexus pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.