Tyre Pressure Monitoring Systems (TPMS) warn you when a tyre is under-inflated - often before you feel it in the steering. Replacing a sensor sounds straightforward until you discover that frequency, protocol, valve stem design, and programming all vary by make, model, and market. This guide explains how TPMS works on UK and European cars, how OE part numbers and cross-references fit together, and how to order the correct sensor first time.

What TPMS does

Each monitored wheel reports air pressure (and on many systems, temperature) to the car’s body control module. If pressure drops below a calibrated threshold - often around 20-25% below the recommended cold pressure - a warning lamp appears on the dashboard. The goal is early warning: under-inflation increases fuel use, wears tyres unevenly, and raises the risk of blowouts at motorway speeds.

On UK cars registered from November 2014, TPMS is part of the MOT test where fitted. A permanently lit TPMS warning can fail the test even if tyre tread is legal.

Direct vs indirect TPMS

Direct TPMS

A battery-powered sensor sits inside the wheel - usually clamped to the valve stem or band-mounted on the rim. It transmits a radio signal with pressure data. This is standard on most European cars from the late 2000s onward. When garages say they need to “programme” or “clone” a sensor, they almost always mean direct TPMS.

Indirect TPMS

The car compares wheel rotational speeds via ABS sensors. A soft tyre has a slightly smaller effective rolling radius and spins faster. No sensor in the wheel, but calibration is required after tyre changes and the system is less precise. Common on some older BMW and Volkswagen setups; less common on brand-new models.

433 MHz vs 315 MHz - UK vs US

Direct sensors transmit on a fixed radio frequency. UK and European vehicles overwhelmingly use 433 MHz. North American vehicles typically use 315 MHz. A sensor with the wrong frequency will never be received - no amount of relearn will fix it.

• UK / EU market car: assume 433 MHz unless you know the car was imported from the US or Japan with US-spec hardware.
• Japanese domestic market (JDM) imports may use 315 MHz on some models - check existing sensor label or supplier data.
• Grey imports and ex-US military vehicles are frequent sources of wrong-frequency orders.

Right-hand drive vs left-hand drive does not determine frequency; market of manufacture and sensor part number do.

Who makes OEM sensors

Car manufacturers rarely build sensors themselves. Common OEM suppliers include:

• Schrader (Sensata) - widely used across European marques; often branded Schrader on the valve stem.
• HUF / Continental - common on BMW, Mercedes-Benz, Audi, and VAG group vehicles.
• TRW / ZF - appears on various Ford, Stellantis, and premium applications.
• Pacific Industrial / others - secondary sources on some Asian marques.

Aftermarket “cloneable” or pre-programmed sensors emulate these protocols. Quality units work well when matched correctly; budget unbranded sensors may fail early or not hold programming after relearn.

OE part numbers and cross-reference

Each marque uses its own numbering. Examples you may see on invoices, ETKA, or the sensor body (always verify against your exact vehicle):

Marque	Example OE references	Notes
BMW / MINI	36106881890, 36106859557, 36106856227, 36106887147, 6855538	Later UK/EU F- and G-series cars are commonly 433 MHz; some imports and older chassis differ.
Mercedes-Benz	A0009053100, A0009051714, A0009056100, A0009057200	Rubber vs metal valve and snap-in vs clamp-in vary by wheel type.
Audi / VW / Skoda / SEAT	5Q0907275B, 7PP907275F, 1K0907275B, 4F0907275D	MQB platform sensors are not backward-compatible with all PQ models.
Land Rover / Jaguar	LR086929, T2H14245, C2Z15278, LR070840	Range Rover and import models can vary between 315 MHz and 433 MHz by year; scan the old sensor if unsure.
Ford	DE8T-1A180-AA, F2GT-1A180-AB, EV6T-1A180-CB	Match by model year and valve type; do not assume all Ford sensors share one protocol.
Vauxhall / Opel	13598773, 13581558, 13474178	Common on Astra, Corsa, Insignia, and Mokka listings; verify against the old sensor body.
Toyota / Lexus	42607-02031, 42607-30060, 42607-48020	Japanese-market imports may not match UK lookup data; VIN or scanned sensor ID is safer.
Honda	42753-T6N-A01, 42753-SHJ-A53, 42753-SWA-A53	Many direct systems need a TPMS or OBD relearn after fitting new sensors.
Volvo	31341893, 31414189, 31302096	Valve stem design and production year matter; check the sensor label before ordering.

Supplier cross-reference charts map OE numbers to aftermarket SKUs (e.g. Schrader XX-xxx). Two different OE numbers can point to the same physical sensor after a supersession; conversely, similar-looking sensors may use incompatible protocols. Registration lookup is a starting point - sensor part number from the old unit or a tyre shop scan tool is better confirmation.

When you need a new sensor

• Internal battery exhausted - typical life five to ten years; warning may appear before the tyre looks flat.
• Physical damage during tyre fitting (over-torqued nut, broken stem).
• Corrosion on metal-stem sensors in coastal or winter-salt areas.
• New wheels requiring a different valve design (clamp-in vs snap-in).
• Persistent warning after puncture repair near the sensor.

Replacing all four at once is not always necessary - replace the failed unit or any damaged during service. Some owners refresh all sensors when fitting new tyres on an older car to avoid repeat garage visits.

Programming and relearn procedures

After a new direct TPMS sensor is fitted, the car must store that sensor's ID. Until relearn is complete, the dashboard may show a fault even if the sensor is the correct frequency and part number. This is normal - it does not always mean the part is wrong.

• Auto-learn via drive cycle - some US and Asian models learn after a prescribed speed/distance once pressures are correct.
• OBD diagnostic tool - common on BMW, Mercedes, VAG, Ford, and many others - writes or registers sensor IDs through the OBD port.
• TPMS trigger tool - wakes each sensor in sequence while the vehicle is in relearn mode (often used with GM, Toyota, Nissan, and some Ford procedures).
• Indirect reset - menu reset after setting correct pressures - no sensor in the wheel.

How relearn works

Each direct sensor broadcasts a unique ID (and pressure data) on 433 MHz or 315 MHz. Your car's TPMS control unit keeps a list of allowed IDs - usually one per wheel position. When you fit a new sensor, that ID is different from the old one, so the car reports a fault until relearn tells the module to accept the new ID for that corner.

Relearn is not the same as inflating tyres. A menu reset only recalibrates pressure thresholds on some systems. Replacing a sensor almost always needs ID registration - either through OBD, a trigger sequence, or a drive cycle depending on the marque.

Real tools tyre shops use (search by model number)

These are established products from Autel, ATEQ, Launch, and Foxwell - not generic "RF trigger" gadgets. Search the exact model on the manufacturer site or a UK tool supplier before buying. We do not show tool photos here because firmware, coverage, and kit contents change by year.

Tool	What it does	Notes for UK owners
Autel MaxiTPMS TS508 / TS508WF	Activates sensors, OBD relearn, reads TPMS DTCs; includes OBD cable	Common DIY and workshop choice for OBD write relearn on BMW, Mercedes, VAG, and others
Autel MaxiTPMS TS608	Tablet tool with TPMS plus wider vehicle diagnostics and OBD relearn	Higher-end option if you already want full-system scanning
Launch CRT5011E / Creader TPMS 5011 V2	Activates 315/433 MHz sensors, OBD relearn, manual ID entry for unbranded sensors	Explicit support for manual ID and copy-by-OBD on programmable sensors
Foxwell T1000 / T2000 Pro	Sensor activation and relearn procedures on screen; T2000 adds OBD relearn	Note: Foxwell T10 is a programmable sensor, not the scan tool
ATEQ VT56 (with OBD)	Activates sensors, programs aftermarket sensors, OBD relearn via built-in OBD	Professional tyre-shop standard; Sync-ID OBD relearn on many European cars
ATEQ VT36	Activates and reads sensors; programs blank aftermarket sensors	No onboard OBD relearn - pair with an OBD-capable tool where the car requires ECU write
Digital tyre pressure gauge	Checks cold pressures before any reset	Any branded gauge from Halfords, Screwfix, etc. - fixes more warnings than scanners alone

Legacy ATEQ VT55 units still appear in older workshops but were discontinued - current ATEQ lines are VT36, VT56, and newer VT5x/VT6x tools with regular software updates.

Unbranded sensors - no dropdown on the tool

Our TPMS listings are often unbranded aftermarket units matched by OE part number and 433 MHz (UK/EU). They behave like other cloneable sensors, but Autel, Launch, and similar tools will not list "Automotive Outlet" or a Schrader/HUF logo in a sensor picker - there is no brand to select.

What to do instead:

• On Autel: use Position Relearn → OBD relearn, or read/activate the sensor and write the ID - not "pick Schrader from list".
• On Launch CRT5011: use Manual Creation, Copy ID by Activate, or Copy ID by OBD for unencrypted/unbranded sensors.
• Hold the tool at the tyre sidewall above the valve to activate the new sensor and confirm its ID before OBD relearn.
• Register that ID to the correct wheel position (FL, FR, RL, RR) in the car module.

Typical OBD relearn steps (direct TPMS)

Exact menus differ by tool and car, but the workflow is usually:

1. Inflate all tyres to the door-jamb cold pressure.
2. Connect the TPMS/OBD tool and choose your make, model, and year.
3. Select TPMS service → Relearn / Program sensors (wording varies).
4. Start relearn on the tool - the dash may show a message or the horn may chirp.
5. For trigger-type procedures: wake each sensor in the order the tool or handbook shows (often FL → FR → RR → RL).
6. For OBD-write procedures: let the tool register each new ID to the module - confirm success before moving to the next wheel.
7. Drive for 5-10 minutes if requested, then verify the warning is off and live pressures appear if your car displays them.

Quick marque notes:

• BMW / MINI - often OBD relearn via iDrive reset plus tool for new sensors; 433 MHz on most UK cars.
• Mercedes-Benz - frequently needs OBD registration after sensor swap; check RHD and wheel size variants.
• VAG (Audi / VW / Skoda / SEAT) - OBD relearn common on direct systems; MQB vs PQ sensors are not interchangeable.
• Ford / Vauxhall / Stellantis - mix of trigger relearn and OBD depending on year; some indirect cars only need a menu reset.

Can you relearn at home?

Yes on many models if you buy a supported tool (for example Autel TS508 or Launch CRT5011E), update its vehicle database, and follow the on-screen relearn for your exact year. Indirect systems and simple menu resets only need a pressure gauge.

Use a tyre shop or garage when you lack tool coverage for your model, when the light flashes (missing or dead sensor), when you are unsure of 433 vs 315 MHz, or when multiple sensors failed at once after tyre work. A £20 menu reset attempt will not fix a sensor that was never registered.

A correct sensor that is not relearned will still trigger a warning. If your garage says the sensor is "wrong" after fitment, ask whether relearn was completed and whether they tried manual/generic ID entry for an unbranded unit.

Ordering from Automotive Outlet

We stock TPMS sensors for popular marques in our eBay range and on this site. For best results provide:

• Registration or VIN
• Photo of the existing sensor label (frequency and part number if visible)
• Whether the car is UK-spec or import
• Metal vs rubber valve and snap-in vs clamp-in if known

If you are booking a tyre or wheel change, order the matched locking wheel bolt key at the same time if you are unsure where it is. Garages cannot remove wheels without it.

Changing wheels at the same time? Order your locking wheel bolt key before the appointment so tyres can be removed without delay.

FAQ

Can I swap sensors from another car?

Only after reprogramming to your vehicle’s IDs. Unprogrammed used sensors will not work plug-and-play.

Tyre pressures are correct but the light is on - faulty sensor?

Often yes, or relearn was skipped. Confirm pressures cold, then diagnose the sensor before replacing tyres.

Do foam tyres or sealant damage sensors?

Run-flat sealant can clog or corrode valves; tell the fitter if sealant was used.

Is TPMS the same as wheel bolt security?

No - separate systems. We cover wheel security in our locking bolt guide.

Can I fit a 315 MHz sensor to a 433 MHz car?

No. The vehicle receiver is tuned to one frequency family. A wrong-frequency sensor will not be fixed by resetting the menu.

Can a tyre shop read my old sensor before I order?

Yes. A TPMS scan tool can often read frequency, sensor ID, battery state, and protocol, which is more reliable than guessing from registration alone.

My tool has no brand for your sensor - is it faulty?

Not necessarily. Unbranded sensors need manual ID or generic-sensor relearn, not a Schrader/HUF dropdown. Match the OE part number on the listing, then register the sensor ID with OBD or trigger relearn.

Do I need a dealer to relearn aftermarket sensors?

No - any garage or DIY user with the correct TPMS tool and procedure can relearn them. Dealers are one option, not the only one.

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