What Is It?

The main purpose of the OBD X BOX is to Assist Technicians to Fix any elusive intermittent faults which may be present before or after any repairs causing the EML to come back on.

Unlike all existing OBD Scan Tools, the OBD X BOX uniquely shows and refreshes both Registered and Pending OBD Fault codes, all together, on the same page and at the same time.

Pending fault codes are often overlooked by Technicians but should always be checked, before, during and after repairs. The OBD X BOX auto refreshes both these code types up to once per sec. (1Hz) allowing Technicians to view them in real time, as and when they occur without having to exit and to manually refresh them. This feature is very useful particularly during final road testing before returning a customer’s vehicle whilst assuming its finally fixed when it may not be.

OBD X BOX Fault Codes

Available in 2 variants, it is an advanced, new generation, OBD Scan Tool that’s initially connected to the vehicles 16 pin OBD port but can also be hard wired directly onto 4 wires at the back of the OBD port using the optional hardwire installation kit. If required, it can also be connected anywhere on the engine management systems CAN High and CAN Low wires along with a chassis ground and either ignition live or permanent 12 volt supply from pin 16 of the OBD port, or (optional) 12 volt ignition switched live .

The OBD X BOX automatically deletes selected fault codes that the technician has already added to its auto delete list and also displays how many times individual fault codes have re-occurred before being deleted. Further anticipated codes that may bring on the EML can also be added from the included “P code” Database.

OBD X BOX Database

Technicians can choose a maximum limit of how many times individual codes are deleted, and when reached, auto code deletion pauses, allowing the EML to come back on. Knowing how frequent a fault code has occurred helps the Technician decide how soon to re-book the vehicle for what should now be a much easier and quicker fault to diagnose and fix.

OBD X BOX Settings

The OBD X BOX deletes codes up to 10 times per sec. (10Hz) allowing Limp Mode to be overridden on some vehicles, assisting Technicians in cleaning DPF’S, EGR valves, sticking turbo’s etc. This feature is very useful when collecting vehicles in “Limp Mode” and in some breakdown situations.

This feature is for diagnostic purposes only and as such, and for obvious safety reasons, should not be used permanently on any road vehicles.

With the Fix Assist box temporarily installed, the vehicle can be returned to the customer for them to use, knowing the EML will not stay on permanently if the intermittent fault re-occurs.

This will prevent most vehicles from going into limp mode and still keeps them driveable, in a way the customer is saving you time and money by road testing their own vehicle while the
OBD X BOX continually records and stores any fault codes and the frequency they occur at.

Should a new fault code occur that hasn’t been added to the delete list, the OBD X BOX will pause deleting allowing the EML to eventually come on and to display any new registered or pending fault codes. These new codes may be relevant to the original fault and therefore further assist in the fix.

Another feature added to the OBD X BOX is the OBD Health Check which, put simply, will save Technicians and Car Sales company’s valuable time, money, and lost sales.

This feature continually requests any registered or pending OBD fault codes from the vehicles Engine Management ECU, adds them to its delete list, deletes them automatically within a few seconds and even records how many times they have each occurred before being deleted, an industry first!

What Inspired the OBD X BOX?

Since around the mid 1980’s I’d developed a passion for diagnosing and repairing early engine management system faults on petrol fuel injected cars. The main tools I used back then were a Crypton 440 Cruise Mate with 4 gas analyzer and various handheld multi-meters and real time live oscilloscopes.

Around about 1988 I bought my first ECU Scan Tool; this was the brand-new Crypton Check Mate made in Bridgewater, Somerset by Crypton Technologies. Other diagnostic tool manufacturers soon brought out similar Scan Tools, all these connected to the vehicles ECU using connectors specific to various vehicle manufacturers around at that time.

A few years later the industry was standardized with all vehicles using the same type 16 pin OBD diagnostic port and EML (Engine Management Light). Not long after this, Common Rail diesel (CRD) engines started using the same OBD technology as they were also installed with complex engine management systems very similar to their petrol variants.

All this new technology should have helped our motor vehicle Technicians, but in some cases, it made our task of diagnosing and repairing vehicles more difficult. Firstly, the general public now believed we had a magic box that just plugged into the OBD port and automatically told us exactly what was wrong with their vehicle. Secondly, their vehicle handbook told them in most cases that if the EML came on they must not drive the vehicle, this has caused the motor trade all sorts of problems. Roadside Recovery Breakdown companies such as the AA, RAC and Green flag are inundated with customers refusing to drive their vehicles because they have the EML on.

From many years’ experiences in this trade, I can honestly say that in most cases it is still safe to continue driving a vehicle with the EML on. Unfortunately, most customers don’t possess our understanding of vehicles, and some wouldn’t want to make the decision to drive with the EML on.

So, for many, many years I’d been diagnosing engine running faults without the help or hindrance of an EML coming on or the engine going into Limp Mode, so now what? A lot of my self-taught methods of repairing and diagnosing faults involves different types of emulation to prove if an engine can be made to run correctly, even before repairs are carried out.

So, I thought to myself, how can I use Limp Mode to test the running capabilities of an engine and how can I use the Engine Management Light to my advantage?


When an engine is stuck in Limp Mode a technician would normally have to diagnose and repair any known faults before proving the engines drivability. I soon worked out that by deleting EML codes as fast as 10 times per second would enable most vehicles to be driven out of Limp Mode as if the fault does not exist. Using this method would confirm individually if the engine’s, exhaust system, fuel supply, turbo, EGR or DPF were working correctly by selectively targeting and deleting chosen fault codes.

Although not quite the same as emulating voltage, vacuum or pressure, I’d now found a new method of diagnosing and influencing the vehicles Management System using the OBD.

The EML is your friend.

You may not think so at times, but the EML is there to tell you as a customer and as a vehicle Technician that all is not well, used correctly it can assist you in diagnosing any EMS faults.

A Garages worst scenario is when engine repairs have been carried out on a vehicle and charged for, and then the vehicle is returned soon after with its EML back on.

Similarly, a customer keeps coming back to tell you his EML is staying on but then randomly going off but then coming back on again, whilst not able to give you any valuable information.

Some customers can be quite reasonable and understanding whilst others are not, they will become a garage owners’ worst nightmare by refusing to drive the vehicle if the EML is on.

I soon realized what was needed was a means not only to target and to delete selected fault codes but also to monitor how frequently they occurred. Furthermore, if I could use the Customer to assist me as to when, and under what conditions any faults were most pronounced, then this would help to diagnose any faults much sooner.

An optional Piezo beeper was added to the OBD X BOX so that Customers could now monitor precisely and report back to the garage under exactly what engine speed, temperature and loads etc. they heard the beeper sound. Armed with this previously unavailable information the Garage would now have a much greater chance of diagnosing the fault.

As Fuel Injection Specialists ourselves we have been using the OBD X BOX during its development for over two years now with fantastic customer feedback. Not only have we experienced amazing and time saving results, but we have significantly increased workshop profitability too.

Automatic Transmission and 4WD Codes

Most Automatic and Semi-Auto new generation vehicles are installed with a transmission ECU that communicates with the engine management ECU using the vehicles Can Bus system. If any faults occur, error codes can be read not just from the Transmission ECU but often through the Engine ECU. The OBD X BOX in most instances can read and delete most of these codes in a similar way it deletes engine EML codes, sometimes overriding “Limp Mode”.

OBD X XBOX Database
Andy Axford

“An unbelievable must have piece of kit”

Andy Axford, Lancs Transmissions Ltd, Bolton

OBD X BOX Status

OBD X BOX Connected Status icon

OBD X BOX Connected To PC
Or Bluetooth Device

OBD X BOX Communicating icon

OBD X BOX Communicating
Through OBD To ECU

OBD X BOX Check Engine icon

OBD X BOX Code Deletion Paused
New Unselected Code Present

LED Status

OBD X BOX LED Status icon

• LED Permanently On OBD Power Connection OK

• LED Flashing Slowly Communication OK With OBD

• LED Long Flash Then Pause Code Erasing In Progress

• LED 5.0 Secs off 0.2 Secs on Sleep Mode (No RPM Present)

Hard Wire Option

OBD X BOX Hard Wire Option

Discard OBD Plug from main harness and connect wires 4, 6, 14 and 16 to rear of OBD Port in accordance with wire colours.


‘Double Click’ DTC'S To Add Or Remove Them From The Delete List

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