C1246 fault code: what it means

C1246: Master cylinder pressure sensor fault on a Lexus. Brake assist and VSC may be disabled.

Chassis (brakes, steering, suspension) · Costly if missed

Usual causes, most likely first

failed pressure sensor (in the brake actuator on hybrids)
sensor wiring fault
low brake fluid

C1246 by make

Lexus

Master cylinder pressure sensor fault on a Lexus. Brake assist and VSC may be disabled.

Usual causes: failed pressure sensor (in the brake actuator on hybrids); sensor wiring fault; low brake fluid

Toyota

Master cylinder pressure sensor fault in the ABS/VSC system. Brake assist and VSC may be disabled.

Usual causes: failed pressure sensor (part of brake actuator on some models); sensor wiring fault; low brake fluid

What the repair usually costs

ABS / brake booster actuator replacement (Toyota hybrid)NZ$1,280–NZ$3,430 · A$1,140–A$3,090
CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510
Brake fluid flush and bleedNZ$90–NZ$180 · A$90–A$190

Not sure what C1246 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.