Renix Engine Monitor II + (V5.3)

(8 customer reviews)


  1. The Ultimate Renix Jeep Scan Tool has arrived!
SKU: REM-II-V5.3 Categories: ,


STOCK UPDATE: Due to the ongoing global chip shortages, REM production has been forced to stop until further notice. Only very vague estimates of some time 2023 are available right now.

Feel free to check the chip stock yourself for current information: NXP USA MK20DX256VLH7

Usually ships in 1-2 business days if everything is in stock.

NOTE: This IS NOT the clock panel version and will not fit in the dash panel.

Older Demo Video here:

Compatible Models:

1986-1990 2.5L TBI Renix Engines

1987-1990 4.0L MPFI Renix Engines

1986-1990 AW-4 Auto Transmissions

1989-1990 Bendix ABS Systems


Have a 1986-1990 2.5L or 1987-1990 4.0L Jeep with Renix EFI and 15 pin Diagnostic Port? Old Jeepers unite, the REM is here for your diagnostic needs!

The REM is a Plug-and-Play homebrew scantool decked out with the latest tech to read in your Renix Jeeps Engine and Transmission computers’ data for a wealth of information on all the various sensors and readings throughout! A Check Engine Light has been added to alert of possible sensor issues or failures. By combining Transmission and Engine data you can even keep an eye on fuel economy! With included USB port or Micro SD card slot, data logging will be available to diagnose troublesome issues off vehicle as well.

But I couldn’t just stop there; this Open Source and Mod Friendly device is fully compatible with Arduino and includes a wealth of bonus features like a 3 Ch Fan Relay Controller, Analog Voltage and Resistance Reading, and a Signal Generator for low level piggyback engine tuning! A lot of new features and software are constantly being developed to create the ultimate car-puter device for your old Jeep!


– Portable Plug-&-Play Scan Tool that can be used anywhere!

– Shows Live Engine Data and Reports basic sensor faults

– Shows Live Transmission Data and TCU Error Codes

– Check Engine Light alerts when faults are detected

– Auto-dimming RGB LCD Screen can display 4 readings at once

– Helpful diagnostic tips and Description booklet included

– Built-in 3 channel Fan Relay controller for running custom setups

– Micro SD Slot for future datalogging

– Micro USB port for datalogging and software updates


Bluetooth Module: Remotely monitor live data on an android phone with XJBlueTalk App

Gyroscope Module: View the vehicles current Roll and Tilt for extreme off-camber situations. (Accelerometer and Magnetometer features not explored yet)

Bonus Mod Jack: Adds a 6-pin jack and pigtail to the REM to access additional modding capability. This gives access to a fused 5v Rail, Ground, 2x 5v analog inputs, 1x low current relay driver, and an empty pin to be customized. This would be useful for interfacing with in-vehicle things like custom gauges(wideband or other), custom sensors(fuel pressure or other), or turn things on or off(Like a dash light or small relay.)

DMM Jack Adapter: This is being soft discontinued as it is rarely used by customers; see main store if you really want one. Adds a Banana Jack in the Diagnostic Adapter so the REM can easily measure Voltage or Resistance with included probe like a Digital Multimeter (This feature is still in beta)

In the box:

– REM II+ Scan Tool

– REM to Renix Diagnostic Adapter

– 10′ Ethernet Cord

– Velcro

– Quick Start Manual

Additional information

Weight 12 oz
Dimensions 4 × 1.2 × 2 in

Stock, Bluetooth, Maxed

8 reviews for Renix Engine Monitor II + (V5.3)

  1. Richard Saunders (verified owner)

    This is an absolute MUST have if you have a Renix Jeep engine. I purchased a 1989 Jeep Comanche with a 4.0 Renix system engine with several fuel and electrical issues that I couldn’t isolate until I purchased this monitor. It isolated the problems and I now have my Manche purring! I have it mounted to my dash with Velcro and use it as a continuous monitor, wouldn’t want to be without it. It is a great money and time saver. Thanks, Nick.

  2. Travis Schoen (verified owner)

    Best thing ever. Has helped me diagnose issues without having to pull out my multimeter and backprobe wires until I figure out what is wrong. It is great to see my fuel trim, knock sensor, and ignition timing in real time and the fault monitor has saved me by showing me potential problems creeping up before the parts themselves fail. Am looking forward to an in dash model someday, and will buy that when it arrives as well.

  3. Rick Widebrook (verified owner)

    Review for Renix Engine Monitor II + (V5.2)
    ★ ★ ★ ★ ★

  4. Josh (verified owner)

    Review for Renix Engine Monitor II + (V5.2)
    ★ ★ ★ ★ ★

  5. Johnny Peters (verified owner)

    Review for Renix Engine Monitor II + (V5.2)
    ★ ★ ★ ★ ★

  6. Billy (verified owner)

    Review for Renix Engine Monitor II + (V5.3)
    ★ ★ ★ ★ ★

  7. Justin Poley (verified owner)

    My 2nd REM unit! I had one prior on my first comanche that I loved so I had to have another. Has been a huge help with fixing this old neglected truck.

  8. Ben (verified owner)

    My 1989 Jeep Cherokee, wouldn’t be alive without it. In addition to 15 year service interval things, a handful of esoteric sensor and vacuum issues began plaguing it –all within a week. Using the various monitor readings and diagnostic tools at a repair shop, we were able to resolve over 7 faults one by one. Now it passes smog and gets 20mpg on the highway again!

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