P2594Turbocharger Speed Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2594 means the second turbocharger speed sensor produces a signal, but its reported speed does not agree with what the engine computer predicts for that turbo. Bentley documents it on the W12 in the Continental GT/GTC, Flying Spur and Bentayga (bulletin 2053348, versions 5 and 10): after a smoke test of intake and exhaust, a detached divider inside the air filter box on Continental and Flying Spur turned out to be one cause; with symptom code 23179 alone the code is cleared and retested without parts, while symptom code 32790 leads to a new speed sensor. P2593 and P2595-P2597 are circuit faults of the same sensor, P2579 the matching fault on sensor A. The warning lamp comes on.
- What you may notice
- Malfunction indicator lamp on
- Fault often appears only under particular load or gradient conditions
- Turbo speeds of both banks differ noticeably in live data
- Likely causes
- LikelySpeed sensor B delivering an implausible signal
- PossibleDetached divider in the air filter box disturbing the flow to one turbo
- PossibleIntake or exhaust leak on the bank of the second turbo
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.