The MAP sensor is reading but the values don't match engine load — a very common cause of limp mode on UK diesels.
P0106 — also written PO1O6, P 0106, 0106 — is the OBD-II code for map/baro circuit range/performance. Same code, same fix: this page covers every spelling of it.
MAP / boost pressure sensor 'range or performance' — the ECU sees a pressure reading that doesn't match engine load. On UK turbo diesels it's almost always a split intercooler hose, a cracked plastic charge pipe, or a carbon-caked BMW N47 swirl-flap intake — the sensor itself is faulty maybe one time in five. Get this misdiagnosed and you'll pay £180 for a sensor that solves nothing.
P0106 is a sensors fault code, typically costing £60–£400 to put right in a UK garage.
What P0106 actually feels like to drive
- 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)
What causes P0106?
- Blocked MAP port with carbon
- Failing MAP sensor
- Intake leak
- Turbo boost leak
UK vehicles that throw P0106 most often
- Ford Focus / Kuga / Mondeo 2.0 TDCi — split intercooler-to-throttle hose behind the headlight
- Vauxhall Astra J / Insignia / Zafira 1.6 & 2.0 CDTi — cracked plastic intake elbow, brittle by 80k
- BMW 1/3 Series 118d/320d N47 — carbon-caked intake with failed swirl flaps stores P0106 + P0299
- Audi A3 / VW Golf / Passat 2.0 TDI CR (CAGA/CBAB) — degas hose split at crimp
- Nissan Qashqai / Juke 1.5 & 1.6 dCi — MAP sensor genuinely fails around 90k, oil-fouled
- Mercedes C220 / E220 CDI (OM651) — turbo actuator sticks and MAP reads wrong under load
- Ford Fiesta / Focus 1.0 EcoBoost petrol — degas hose or intercooler-to-throttle at crimp joint
How P0106 is fixed
- Clean or replace MAP sensor
- Smoke-test intake and boost pipes
- Check EGR isn't stuck open
The P0106 misdiagnosis that wastes money
P0106 is one of the highest-margin misdiagnoses in the trade: garages read the code, sell a £180 MAP sensor, and the customer is back inside 200 miles with the light on again. Bob's 32 years on the tools rule for P0106: NEVER fit a MAP sensor until you've pressure-tested the entire charge circuit at 12–15 psi with soapy water and had eyes on every hose, clamp and intercooler seam. On Ford 2.0 TDCi the leak is 90% of the time the black concertina hose behind the headlight — 30-second visual, £45 part. On Vauxhall 1.6/2.0 CDTi it's a hairline crack in the plastic intake elbow between the intercooler and the EGR — nearly invisible cold, opens up hot. On BMW N47 the whole intake needs pulling and walnut-blasting because the swirl flaps have shed metal into the manifold and blocked the MAP port. On Ford 1.0 EcoBoost check the degas hose at the coolant reservoir first — same fault as the P0299 crowd. If pressure-test passes clean AND live data shows commanded vs actual boost within 10%, only then look at the sensor.
What a UK garage should charge for P0106
UK independent garage: smoke / pressure test £40–£80 (this is the appointment that saves the money, not the parts). Intercooler hose or charge pipe £45–£140 fitted. Plastic intake elbow (Vauxhall A20DTH) £65–£140 fitted. Genuine Bosch/Siemens MAP sensor £60–£180 fitted. Intercooler £180–£420 fitted. BMW N47 intake manifold clean + swirl-flap delete + carbon walnut-blast £480–£900. 1.0 EcoBoost degas hose £35–£95 fitted. Turbo actuator (Mercedes OM651) £320–£560 fitted. Main dealer: 40–70% more. Never authorise a MAP sensor without a written pressure-test result — that paperwork is your evidence if the code returns within 90 days.
P0106 repair cost in the UK
Most P0106 repairs land between £60–£400 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Bob's tip on P0106
Bob's real workshop shortcut for P0106 in 60 seconds: engine warm, bonnet up, engine off. Run your hand slowly along every intercooler pipe from turbo outlet to throttle — any oily residue, any grit stuck to a joint, any hairline crack you can feel with a fingernail IS your leak. Diesel intercoolers weep a fine oil mist over years, and the mist collects at the failure point. On BMW N47, if the P0106 arrives alongside a slight rattle from the front of the engine, stop driving — the timing chain is also on the way out and the two jobs get done together (intake off is 3 hours of the chain job for free). On Ford 1.0 EcoBoost, if P0106 arrives alongside coolant loss you have a much bigger problem — the wet-belt engine is in serious trouble and needs a compression test before another mile. And if a garage quotes you for a MAP sensor without documented pressure-test paperwork on the invoice, get a second opinion first — you can <a href="/ask-a-mechanic-uk?code=P0106">Ask Bob about P0106</a> for £14.99 and get a written second opinion before you spend £180 on the wrong part.
Can you drive with P0106?
Drivable but likely in limp mode.
Urgency: medium.