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🔍 Decode your GM’s secrets before they become costly surprises!
The INNOVA 3123 GM OBD1 Code Reader is a reliable, corded diagnostic tool designed for GM vehicles from 1982 to 1995. It safely reads engine and ABS trouble codes via the vehicle’s self-test connector, providing multilingual instructions for easy use. Ideal for professionals and DIYers alike, it helps quickly identify issues to save time and money on repairs.


| ASIN | B000EVU8C0 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #4,333 in Automotive ( See Top 100 in Automotive ) #26 in Code Readers & Scan Tools |
| Brand | Innova |
| Brand Name | Innova |
| Customer Reviews | 4.4 out of 5 stars 6,878 Reviews |
| Global Trade Identification Number | 00042173031238 |
| Included Components | Code Reader^ Insert Card |
| Item Type Name | Innova 3123 GM OBD1 Code Reader |
| Item Weight | 0.64 Pounds |
| Manufacturer | Innova |
| Manufacturer Part Number | 3123 |
| Manufacturer Warranty Description | 1 year limited |
| Model Number | 3123 |
| Number of Items | 1 |
| Operating System | Windows XP |
| Part Interchange Info | 3123 |
| Power Source | Corded Electric |
| UPC | 042173031238 |
A**F
92 Chevy truck OBS fixed in 5 minutes
Worked like a charm. Out nowhere my truck started sputtering and not turning on. Like and old school car i would pump the gas and it would sputter and struggle to stay on. I was thinking fuel injection or fuel pump. Boy was I wrong connected this to the OBD1 port and counted the flashes and referred back to handy dandy book for codes. Turned out to be a $15 temperature sensor and a quick 5 minute swap. The bad sensor was sending incorrect reading so was causing the truck to try and adjust for fuel consumption apparently. Without this I would of wasted money and time on fuel pump and removing the bed of my truck.
C**.
Well worth the money!
Nice book with lots of clear ENGLISH instructions and extra general info about how the computer works etc., and a full list of codes. Unit itself is professional looking high quality gear, you won't be embarrassed to use it. (Unlike how dirt-cheap some certain orange colored tools from a certain unnamed place can appear) I bought a '93 Lincoln Towncar, and it has an intermittent MIL. It's "EGR insufficient flow" so can be largely ignored. If a couple cans of Seafoam won't cure it in the next couple of weeks, I'll replace the $35 EGR valve and/or clean the carbon out of the manifold passageways. A note about the OBDI which is what these cars have: unlike 'modern' OBDII, the MIL operates in real time. (MIL = Malfunction Indicator Light or "check engine" light) With OBDII, if the MIL is triggered, it stays on for the most part. If it's a one time event, many start/stop cycles might turn it back off, but it usually needs to be cleared. With OBDI, the light may go back out, come back on, go back out as you drive. (It does in my case) The car's computer has a stored code area, which this tester has access to, so, you can see what's triggering the MIL as it happens, AND check the stored codes too. In my case, the codes just refer to the (probably intermittently sticking) EGR valve and nothing else, so the price paid for the code reader is worth the piece of mind at the very least. As for buying the extension cable, (or not) on the Towncar, the OBDI connector is on the driver's side fender, so I can prop the tester up and read it by leaning out the window during run-up testing. It depends on where your diagnostics port is as to whether you need the extension cable. You do need to see the display during real-time testing. If you're chasing an intermittent MIL, you'll need a cable to run under the hood and into a window so you can have the tester inside while you drive and have a friend watch the display.
J**Z
car data
works as described, easy to use, and inexpensive
A**R
The Right Tool for the Job--a "service engine soon" light on a 1989 Chev.
I have a 1989 Corvette that was showing a "service engine soon" light. I've got an OBD2 reader, but that's no use on a car of this age. This unit worked exactly as advertised. I plugged it in, and then read the blinking dash light to get the codes. In my case, the accompanying book indicated I had a problem with my mass airflow sensor and/or my manifold absolute sensor. I cleaned the MAF sensor with the correct cleaner and found that my year's engine does not have a MAP sensor. I also replaced the two relays that control the MAF sensor. No more "service engine soon" light!!!! I read negative reviews of this device and how the pins will can come loose and retract into the plastic housing making the device useless. Not sure if they've improved their manufacturing, or I got lucky, but mine is fine. Finally, The internet is full of very good advice on how you can use a paperclip to jump two of the pins on an OBD-1 port and read the blinking code on the dashboard of these older vehicles. I completely agree that this will work and save you the cost of this device. However, the gymnastics (for me) of holding a paperclip precisely in place (with one hand), while turning on the key and reading (and writing down) the blinking light codes up on the center of the dashboard (with the other hand) made this device an easy decision. Maybe if I had a pickup truck or some other large vehicle with plenty of room in the interior to maneuver, I might have gone with the paperclip.
T**E
Works perfectly!
A really nice pin bridger for obd1 systems. Bridges abs pins with a push of a switch! No problems with it and it works on basically all obd1 vehicles from GM and Ford.
H**E
A great diagnostic tool for trouble shooting engine codes for early Ford trucks
Used this code reader on a 96 Ford F250 with 460 V8. It provided sevetal codes which enabled me to diagnose my ignition problems. A very useful tool and easy to use. You will have to connect it to the connector assembly which is under the hood on the right side of the vehicle below the hood spring.
C**Z
It works; BUT
First, let me give credit where credit is due. The product works, and it's easy to use! I was able to retrieve the codes. Some ports are inside the vehicle, my port was in the engine bay. I was able to do everything needed by myself to successfully complete the test. BUT I have 2 Negatives associated with this product. First, When I plugged the reader into the port in the engine bay nothing happened. when I unplugged it I found that 2 of the 4 Prongs had pushed into the reader. Pure Junk. So I opened it up to see what broke. To my surprize, the wires and connections were still intact. I pushed them back into placed and reglued the reader back together. I plugged it back into the port but the prongs pushed back into the reader again. The tiny little blades where the wires connect to the plastic, I guess are too small and don't hold the connectors in place. I used alligator clips on the ends of the prongs to pull the codes. Second, the booklet fell apart the moment I opened it up to read the directions and again when I was reading the code glossary. The book is poorly made as well. I see You can download the instructions from the web site but why? It comes with a booklet. (was the download an afterthought or did they know in advance) I see now that there is an extension cord you can purchase, this will certainly make it easier to use, then I see others are having the same issue with the prongs and using the cord. so it is definitely an issue with the design and the connections. If they address this issue and solve the problem, then this is a great product for the price. Seems they care a little about the product they have fixed a cheap book by putting making the directions a download. I will attempt to return the product but since I opened it up and then reglued it I doubt I get a refund!
B**R
Must have for OBD1 Fords
Definitely get one of these if you have an older Ford. Sure you can jump the wires and count the flashes, but this takes away the headache of that. Having the codes handy in the manual is also a nice addition. I would also recommend getting the extension cable. Being able to run all the codes from the cab is much more convenient than in the engine bay.
L**S
Excelente equipo
Se ve bien fabricado y la pantalla es grande, aún no lo uso todavía pero en general lo recomiendo
I**.
Sehr hilfreich
Habe durch das Gerät einige Euros an Werkstattkosten gespart - Natürlich muss man sich mit der Materie etwas auskennen.
W**P
1991 Ford F150
Funny that no mechanic had one of these to check my truck. So this came in very handy. Worked well, so the mechanic said. If he's happy, I'm happy.
M**N
Ex value
Brilliant for old ford's easy to use and all good 👍
J**A
Um achado!
Muito bom o produto, já testei no meu carro e foi uma mão na roda, para carros antigos como meu ficar testando via lampejos de lâmpada para descobrir o erro era muita dor de cabeça, este aparelho foi muito útil.
Trustpilot
4 days ago
2 days ago