P12A8 fault code: what it means

P12A8: Boost pressure too low. Power loss; common causes on turbo MINIs are boost leaks and wastegate faults.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

1. boost hose leak
2. sticking wastegate or actuator
3. faulty boost pressure sensor
4. worn turbo

P12A8 by make

What the repair usually costs

• CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
• Intercooler or boost hose replacementNZ$250–NZ$1,780 · A$250–A$1,710

Not sure what P12A8 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.