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View Full Version : Gap IID G4 vs G3


Darren LR3
19th May 2025, 09:53 AM
Hi I'm looking to buy a Gap tool, and am weighing up a G4 vs. a G3. I am wondering whether anyone has found any practical difference between them, I have a LR3 but might possible get an LR4 in the future. Any advice is appreciated.
Darren LR3
19th May 2025, 09:54 AM
Also if anyone has one that they'd like to sell please PM me.
Ferret
19th May 2025, 10:44 AM
...am weighing up a G4 vs. a G3. I am wondering whether anyone has found any practical difference between them, I have a LR3 but might possible get an LR4 in the future. Any advice is appreciated.

If you look on the GAP website you will see a table outlining compatibility differences between the various LR models for the 3 & 4 generations of the GAP tools.
Darren LR3
19th May 2025, 12:04 PM
If you look on the GAP website you will see a table outlining compatibility differences between the various LR models for the 3 & 4 generations of the GAP tools.

Hi, many thanks for taking the time to reply. Yep I've had a look and they look pretty similar for my purposes, I was more interested if anybody had found any practical use differences or oddities.

Cheers
Graeme
19th May 2025, 12:12 PM
The G4 can't access some or possibly all the ecus on vehicles prior to around MY17 or MY18 unless either the special OBD adapter is used or IIRC 2 wires are cut/removed from the OBD port of earlier vehicles. This is because those wires are used for a new OBD protocol used by some modules in the later vehicles.

Wires were cut in a D4's OBD port to allow my G4 (purchased for my MY21.5 L405) as the required function wasn't available on the G2 tool and I wasn't going to buy a G3 tool which had the option just to do this particular calibration nor to buy the adapter.
jwb
2nd July 2025, 12:40 PM
I had the G3 for my Discovery 4 and then got the L663 Defender. While I could read and clear some faults on the L663 with the G3 it could not access any of the canbus diagnostics or do a CCF change if I ever need that. I upgraded to the G4 from Gap for a modest fee. With a G4 I don't think you'll get any added functionality for your D3, will need the OBD adapter or mod as mentioned above on a D4 and will be ready for your L663 in the future!