MAP sensor range on Vauxhall 1.4/1.6 turbo and 2.0 CDTi — the cheap GM-spec sensor fails early plus chronic plastic intake leaks on Insignia.
Vauxhall P0106 — MAP sensor range on Vauxhall 1.4/1.6 turbo and 2.0 CDTi — the cheap GM-spec sensor fails early plus chronic plastic intake leaks on Insignia. Typical UK independent garage cost: £80–£340.
What actually causes P0106 on a Vauxhall
The GM/Delphi MAP sensor on the 1.4T A14NET engine is notoriously short-lived — failures from 40,000 miles are normal. The plastic intercooler-to-throttle-body pipe on 2.0 CDTi Insignias splits constantly (also a P0299 cause) and triggers P0106 simultaneously. 1.6 turbo VXR engines also blow PCV diaphragms which skews MAP readings.
Vauxhall engines that log P0106
- 1.4 Turbo (Astra J/K, Mokka, Insignia)
- 1.6 Turbo (Astra J VXR, Insignia)
- 2.0 CDTi (Insignia, Astra J, Zafira C)
How we diagnose P0106 on a Vauxhall
- Tech2 / OP-COM — log MAP voltage at idle and on snap throttle
- Inspect plastic charge pipe on 2.0 CDTi (and 1.4T elbow)
- Check PCV diaphragm on 1.6T VXR
- Replace MAP sensor as first action on 1.4T over 40k
- Smoke-test intake to confirm fix
The common misdiagnosis to avoid
Don't pay £180+ for a 'diagnostic charge' from a dealer on a 1.4T Astra with P0106 — the sensor is the obvious culprit at any mileage over 40k, and a £35 replacement clears it.
Vauxhall P0106 repair cost in the UK
Expect £80–£340 including parts and labour at an independent garage. Main-dealer quotes on Vauxhall are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
Stock a couple of GM A14NET MAP sensors on the shelf — you'll fit one every other week if you have any Astra J/Mokka/Corsa work, and the customer's grateful for same-day fix.
Codes usually seen alongside P0106 on Vauxhall
- P0299
- P0171
- P0405
Symptoms drivers report with P0106
- Sudden loss of power on a motorway slip road — car drops into limp mode at exactly the point you plant the throttle
- Full power returns after a key-off / key-on cycle, then disappears again 10–20 miles later
- Whistling, hissing or a chuff-chuff noise from the engine bay under acceleration
- Slight oil mist around intercooler pipework or a stain on the underside of the bonnet
- MPG drops 4–8 mpg within a tankful, sometimes with faint black smoke on hard acceleration
- Sometimes paired with P0299 (underboost), P0234 (overboost), or P0401 (EGR flow)
Repairs that clear P0106
- Clean or replace MAP sensor
- Smoke-test intake and boost pipes
- Check EGR isn't stuck open
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0106 guide.