P007A — Charge Air Cooler Temperature Sensor Circuit Bank 1

P007A points at turbocharger or boost control (bank 1). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Common causes

The cause is almost always one of a few things. Here they are — P007A rarely comes from anything outside this list:

• Boost hose split or clamp loose
• Wastegate or variable-vane mechanism sticking
• Boost pressure sensor reading wrongly
• Turbo bearing worn
• Intercooler leaking

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Pressure-test the boost pipework for leaks — a split hose mimics a failed turbo and costs a fraction to fix
2. Inspect the actuator and linkage for free movement
3. Compare the boost sensor reading with the commanded value on live data
4. Check the turbo for shaft play and oil in the intake only after the pipework is proven sealed

That is what holds for P007A in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.