FAQ
TL;DR: Astra 1.7 CDTI P0105 flags the MAP/Baro circuit; "Vacum BOX…ansaugbrücke" and part 97328166 identify the vacuum actuator; check mounting and MAP wiring. [Elektroda, DriverMSG, post #17184047]
Why it matters: This FAQ helps Astra H 1.7 CDTI owners quickly diagnose P0105, avoid turbo-related mislabels, and fix MAP faults without guesswork.
Quick Facts
- P0105 = Manifold Absolute Pressure/Barometric Pressure sensor malfunction; start at the MAP circuit. [Elektroda, Bobasy, post #17184748]
- First action: clean the MAP in petrol/solvent; replace only if cleaning fails. [Elektroda, DriverMSG, post #17185223]
- The pictured vacuum device adjusts intake “fire dampers” (anti‑shudder flaps), not the turbo. [Elektroda, tzok, post #17184270]
- Factory actuator part no. 97328166; also listed as “Vacum BOX” or “Unterdruckdose AGR ansaugbrücke.” [Elektroda, DriverMSG, post #17184047]
- MAP sensors have no fixed service life; failures track contamination or damage. [Elektroda, DriverMSG, post #17185253]
What does error P0105 mean on my Astra 1.7 CDTI?
P0105 indicates a Manifold Absolute Pressure/Barometric Pressure sensor malfunction. The ECU sees an invalid MAP/Baro signal or circuit fault. Prioritize the MAP sensor, its wiring, and the connector. Clear codes after each intervention to confirm the fix. [Elektroda, Bobasy, post #17184748]
What is the vacuum ‘pear’ in the photo, and what does it control?
It is the vacuum actuator for the intake manifold shutoff flaps (often called fire-damper/anti‑shudder flaps). As one expert put it, “nothing to do with the turbine.” It modulates flap position via vacuum to manage airflow during shutdown or specific operating states. [Elektroda, tzok, post #17184270]
Why do listings call it a ‘vacuum turbine regulator’ or Vacum BOX?
Sellers mislabel it. The part is an intake-flap vacuum actuator. You’ll see names like “Vacum BOX” and “Unterdruckdose AGR ansaugbrücke.” Reference the factory number to avoid confusion: “Factory part number 97328166.” That ensures you order the right unit. [Elektroda, DriverMSG, post #17184047]
Can mounting that actuator at an angle cause issues?
Yes. A skewed mount can impede actuator travel or linkage motion. One user reported about a 3 mm tilt. Re-seat it flush on its base and verify the rod moves freely through the full stroke. Correct alignment maintains consistent flap operation. [Elektroda, Bobasy, post #17183715]
Could that actuator be the reason for P0105?
Treat P0105 as a MAP/Baro circuit problem first. Clean the MAP, check the connector, and only then consider replacement. Intake-flap actuator issues affect airflow, but your first diagnostic path is the MAP sensor and wiring. “To begin with, clean the sensor…” [Elektroda, DriverMSG, post #17185223]
How do I clean the MAP sensor safely?
Follow three steps:
- Disconnect the connector; remove the MAP from the manifold.
- Rinse the sensing tip in petrol or solvent; let it dry fully.
- Refit, clear codes, and road-test; replace only if faults persist. “Clean the sensor, rinse it in petrol or solvent.” [Elektroda, DriverMSG, post #17185223]
Is using EGR spray on MAP/BBT worth trying?
A user reported spraying the MAP and a nearby sensor with EGR cleaner, letting them dry, and restoring operation. Use electronics-safe practices and ensure components are completely dry before starting. If the code returns, proceed with deeper MAP diagnostics. [Elektroda, Bobasy, post #17182797]
How long should a MAP sensor last on this engine?
There is no set lifetime or mileage limit. MAP sensors fail from contamination, oil mist, moisture, or physical damage. If cleaning restores correct readings, you can continue using it. Replace only when cleaning and wiring checks do not resolve P0105. [Elektroda, DriverMSG, post #17185253]
What part number should I order for that actuator?
Use factory part number 97328166 when sourcing the vacuum actuator. Cross-check listings that use names like “Vacum BOX” or “Unterdruckdose AGR ansaugbrücke” to ensure you get the correct intake-flap unit. [Elektroda, DriverMSG, post #17184047]
My mechanic says the catalyst is clogged or the DMF is bad. Does that explain P0105?
Those faults can hurt drivability, but P0105 points to a MAP/Baro circuit issue. The thread shows mechanics proposing clogged catalyst or dual‑mass problems, yet the owner focused on the MAP. Confirm P0105 root cause before expensive replacements. [Elektroda, Bobasy, post #17197410]
What other names do people use for this intake flap device?
Community members called it “flaps” or a “fire extinguishing flap.” It’s the same intake shutoff/flap assembly operated by vacuum. These terms arise from its role in damping air during shutdown and managing intake flow. [Elektroda, szymitsu21, post #17183239]
Where can I find a step‑by‑step P0105 diagnostic guide?
See the guide linked by the contributor for MAP diagnosis on this platform. It outlines practical checks for the MAP circuit and supporting components. Use it alongside the clean‑first approach noted above. [Elektroda, DriverMSG, post #17184967]
, colleague above is right 