Porsche Diagnostic Scanners and Adapters

Written by the YOUCANIC technicians in Towson, Maryland, from the UCAN-II Pro coverage database and our own shop work. Updated October 24, 2026.

A Taycan carries more than fifty control units, a 996 GT2 eight, and the parts store code reader talks to one of them on either car. The PSM brake bleed, the parking brake service position for rear pads, the oil service reset, the steering angle sensor after an alignment, the level control fault on an air sprung Cayenne: every one of those lives behind a module the cheap tool cannot see. The tools below are what we use in our own shop in Maryland to reach every module on a Porsche, run the service functions the dealer charges an hour of labor for, and get the car back on the road. The coverage database behind the UCAN-II Pro lists the 996, 997, 991 and 992 generation 911, the GT2 and GT3, the Carrera GT, the 986, 987 and 981 Boxster and Cayman, the Cayenne 9PA and 92A, the Panamera, the Macan, the 918 Spyder and the Taycan. Pick by what you need to do, then check the one adapter rule by model.

Which Scanner Do I Need For A Porsche?

CHECK ENGINE LIGHT ONLY

UCAN-GO

Reads and clears engine codes from your phone and gives you a live gauge dashboard. It does not see the PSM, parking brake, airbag, level control or body modules, and it cannot reset a service interval. Right if the only light you care about is the engine one.

EVERY MODULE, EVERY SERVICE FUNCTION

UCAN-II Pro, new or open box

Full system, bidirectional, lifetime free updates. Reads and clears every control unit, runs the DME and PSM active tests and the Porsche service functions: brake bleed, electric parking brake, oil reset, steering angle sensor, level control bleed and valve tests, tire pressure monitoring, reset adaption values and basic coding. The tool to own if you keep a Porsche running.

ONE JOB THIS MONTH

Rent the UCAN-II Pro for a week

Same scanner, shipped both ways free, with a refundable deposit that comes back when the scanner does. For the one brake bleed, parking brake pad change or airbag code you need done once.

What The UCAN-II Pro Does On A Porsche

• ✓ Reads and clears codes in every control unit: 52 modules on a Taycan, from the DME and PSM brake electronics to the gateway, chassis control (PASM), rear axle steering, rear spoiler, rear lid and the rear end electronics (BCM2); 8 on a 996 GT2, DME, ABS, airbag, air conditioning, alarm, instrument cluster, PCM2 and HBA
• ✓ Bleed, Fill, Fluid fill mode and System check on the PSM brake electronics after a caliper, line or hydraulic unit replacement
• ✓ Electric Parking Brake service function and Service position for rear pads and rotors on the cars with the electric brake
• ✓ Oil Reset, Maintenance interval, Milage since last inspection and Time since last inspection in the instrument cluster, plus Reset with tool
• ✓ Steering Angle Sensor calibration and Calibration routines after a rack, column or alignment job, and the Battery function after a battery change
• ✓ Level Control on the air sprung cars: FA and RA directional valve activation, FA and RA pressure control valve activation, Safety valve activation, Position 1 to 4, Bleed and System check
• ✓ DME active tests: Tank vent valve, radiator fans, Fuel pump 1 and 2, Water pump control, Inlet and Exhaust camshaft, Valve lift adjustment, Secondary air pump, Boost pressure control valve, Exhaust gas flaps, Leakage diagnosis pump
• ✓ Reset adaption values, System adaption, Basic coding, Customer-specific settings, Vehicle variants, Parameterization and Control unit replacement routines, with Coding without rules, Backup codes and Restore codes on the modules that carry them
• ✓ Live data with graphing and recording, plus TPMS: the Tire Pressure Monitoring System function, Write wheel set and the U360 replacement sensor programmed from the tablet

Service Functions By Job On A Porsche

On the tablet you pick the control unit, then the function category, then the routine. Porsche uses four categories in the coverage database: Active Test, Special Functions, Hot Functions (the common service resets) and Programming (local coding). These are the routines the database lists, grouped by the job you are doing, named as they appear on the tablet. Coverage varies by model and year, so check yours before you order.

The database lists about 2,900 Porsche active test entries, 600 special function entries, 90 programming entries and 45 hot function entries. The Taycan carries the most modules; the 996 era cars carry the fewest, so expect the DME, ABS, airbag, cluster and climate functions there and the full list on the newer cars.

What The Scanner Sees On A Porsche

Two vehicles pulled from the coverage database, with the control units the UCAN-II Pro lists on each. Every unit gets fault codes, live data and, where the database shows it, active tests and special functions.

The 996 is the oldest car in the list, so eight modules is the floor; the Cayenne, Panamera and Macan sit between the two rows, with Level Control, PDCC, Park Assistant and the door and roof modules added.

Symptom, Then The Routine That Fixes It

• Spongy pedal after a caliper, line or PSM unit replacement: the Bleed routine in the PSM cycles the pump and valves while you bleed; Fill and Fluid fill mode after a dry system.
• Rear pads on a Cayenne, Panamera or Macan with the electric parking brake: the Electric Parking Brake hot function and Service position before you start, then back out of service position when done.
• Service or oil change reminder still on after the oil change: Oil Reset in the hot functions, then check Maintenance interval and Milage since last inspection in the cluster.
• PSM warning and a steering angle fault after an alignment or rack job: the Steering Angle Sensor hot function, then a short drive to confirm the light stays off.
• Air sprung Cayenne or Panamera sitting low or uneven after a strut or compressor job: Level Control Bleed and System check, then the Position 1 to 4 tests and the directional and pressure control valve activations to confirm each corner responds.
• Tire pressure light after new wheels or sensors: Write wheel set and the Tire Pressure Monitoring System function; or program the U360 sensor to the old ID first.

Frequently Asked Questions

I have a Porsche Taycan. What do I need?

The UCAN-II Pro plus the DoIP adapter. The Taycan runs its diagnostics over Ethernet, and without the adapter most of its 52 modules stay hidden. The same applies to the newest Panamera, Cayenne and the Macan EV.

Can I change rear pads on a Cayenne or Macan with the electric parking brake?

Yes. The Electric Parking Brake hot function and Service position release the motors so the pistons can be pushed back, and the same menu puts the brake back in service when you are done. The parking brake guide covers the sequence.

Will it reset the oil service reminder on my 997 or Boxster?

Yes. Oil Reset is one of the Porsche hot functions, and the instrument cluster also shows Maintenance interval, Milage since last inspection and Time since last inspection so you can confirm the counter moved.

Does it program keys or code new modules on a Porsche?

No. Key programming, component protection and software updates need the Porsche server through PIWIS. The UCAN-II Pro does diagnosis, live data, active tests, local coding and the service functions listed above.

Can I rent it for one job?

Yes. The rental is a one week rental plus a refundable deposit that comes back when the scanner does, shipped free both ways. Most Porsche renters want a brake bleed, a parking brake pad job or an airbag light cleared.

How do I know my exact Porsche and function are covered?

Use the coverage checker by model and module, or call 1-888-959-4265, Monday to Friday 9 AM to 4 PM Eastern, and a technician will tell you plainly. If it does not do what you need, we will say so. Every scanner also comes with 31 day returns, no questions asked.

Working on a different make? See the scanners by make hub, the service functions explained one job at a time, and the step by step repair guides on youcanic.com.