Questions tagged [obd-ii]

On-Board Diagnostics-II (OBD-II). Questions usually involve scan tools, their use and their compatibility, as well as how to interpret Diagnostic Trouble Codes (DTCs).

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Does OBD-II have any means for reporting current oil pressure?

I recently had the low oil pressure warning light come on in my car. After letting the engine cool down, the warning was gone and I was able to drive home (which was just a few km) with no issues. I ...
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2015 Subaru WRX Check Engine Light

The check engine light on my WRX just came on yesterday, along with a batch of other lights. I bought it new, follow the recommended maintenance schedule, and haven't had any other major issues. ...
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Calculate fuel consumption for OBD-II without MAF sensor [duplicate]

Intro: Have create an Android app that connects with vehicle through OBD-II Bluetooth scanner One feature of the app is vehicle's monitoring, through reading and analyzing PID's codes After analyzing ...
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J1850 (V)PWM Physical Addressing (3-Byte-Header)

All OBD2 scanners I have used are solely using broadcast addressing when it comes to talking J1850 V(PWM). I wonder why this is so. If I understand the standard correctly, if 61 6A F1 (68 6A F1 for ...
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Are there online mechanics helping diagnose issues based on OBD2 logs?

My Toyota Kluger (Highlander in the US) has been plagued by recurrent P0171, P0174 (lean fuel mixture) trouble codes ever since I bought it 2nd hand. Apart from the dashboard light, I've seen no other ...
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2007 Suzuki Reno

My OBD2 port has been damaged and I bought a replacement but I can't find the pin out for it. I have 8 wires that I need to know exactly where they belong into the connector. Please help. The wire ...
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Vehicle has power but ODB2 not connecting to ECU

I repaired my car after it had been crashed. I've years of experience but i've been an novice at auto electrical all my life. The vehicle is back together and all systems are operating. I want to ...
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Do electric cars have OBDII interfaces?

For passenger cars in the US, the OBD2 interface has been mandated for many years. The interface allows you to query a lot of car data from the computer using a scanner tool. The OBD2 system also sets ...
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What OBD tool I can use to retard/advance ignition timing? I like to experiment on GM Suburban to burn hydrogen instead of gas

I know Hydrogen burns much faster, so in order to use this fuel in a modern car, the ignition timing tables must be modified. Is it possible to modify the timing so the ignition happens after tdc or ...
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Determine which features of a car are software locked

It's an open secret that a lot of cars these days are built with all of the hardware that they need to perform the operations of "extras" whether or not you pay for them. They're then ...
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Are all OBD2 adapters born the same, or are there differences in what they can do?

Lately I've been getting interested in connecting to my car's computer and seeing some diagnostics information. So I need to get an OBD2 adapter (Bluetooth probably, to pair with my phone). But I've ...
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Oxygen Sensor Diagnosis

I recently had the engine MIL go on on my Mercedes C-Class S205 while driving so I purchased an OBDII bluetooth scanner to figure out what is going on. The code I got was: P2243(92) - Heated oxygen ...
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OBD code P0433 problem

I have just had 195000km service on my Mitsubishi Triton 3.5 Ltd V6. They replaced my air filter and I now have a check engine light. Code P0433 on OBD scanner... replace O2 sensor, exhaust leak. No ...
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OBD2: ELM327 bogus implementation of ATIGN

How is the ELM327's implementation of the ATIGN (check whether ignition is on) supposed to work? AFAIK there is no standardized ignition PIN in the OBD2 socket, hence the adapter has no way of knowing ...
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How does OBD2 work with CAN?

I understand how CAN works (I think). Good info here if you would like to see: Difference between OBDII and CAN So very briefly, there are multiple modules and each module posts interesting data on ...
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Programming remote key Mitsubishi Colt 2007 1.3

I tried programming the remote key, but I can't get car in programming mode as is described in most YT video's by connecting pins 1 and 4 in OBD and pressing 6 times the emergency button. This should ...
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11 votes
8 answers
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What is the point of performing an OBD2 diagnostic scan if there is no malfunction indicator?

Where I live, it is common for car mechanics to help their customers who are planning to purchase a new used car by performing an OBD2 diagnostic test on the car in question, even if there are no ...
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Battery/Memory saver dilemma

A memory saver for your car battery is a connector with a small battery. It has just enough voltage and current to keep all of your car's computer memory alive while you change the main battery. The ...
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Is Garmin's constant power cable "OBD-II" for dash cam a better solution to battery problems?

I had just purchased a Garmin dash cam mini 2. I also bought from Garmin a constant power cable "OBD-II" that has a 10min / 24hr / and infinite switch. It also comes with a dual USB port for ...
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Can a water-damaged OBD2 scanner damage a vehicle?

I have a harbor freight OBD2 scanner which was left out in the rain. I have shaken it out and dried it thoroughly. Assuming it still works at all, is there any way I could damage my car by using it to ...
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I need to add an OBD-II based accessory to a OBD-port-less and ECU-less car

My guess is the accessory would work fine if only provided power (no need for it to receive diagnostics info, just to turn on to perform its function). Would it be possible to connect pins 16 and 4 to ...
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mechanic can't reproduce trouble when car is at shop... need to record OBD data when problem occurs while driving

I brought my car in for servicing, but the mechanic can't reproduce the problem. I want to log OBD data as the problem occurs. I would then provide this captured data with the car when it goes back ...
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P0638 code on 2 different generic scanners but service center says it's the readers that are faulty and the car is fine?

I recently purchased a 2nd hand Kia Rio LX 2018 with 24k miles on the clock. The car drives well, the check-engine light is off, I had a pre-purchase inspection done on it (Lemon Squad) and their ...
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Can issue with P0736 error code produce EM Interference?

I have had an issue with a car where phone GPS doesn't work inside the vehicle. I have just connected my OBD2 diagnostics tool and ran it. I got back 3 issues: P0736 ME - Motor electronics: ...
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KWP OBD2 ECU Target Address

When communicating with an ECU via the OBD2 port using the CAN protocol, we have a well known address $7DF. Irrespective of the make and model of the car this address can be used to read MODE 1 ...
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2 votes
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Using OBD to control add-on lights

I have just purchased a 2021 Ram 1500 Bighorn and plan on adding side lights under running boards. These lights are led strips with amber for marker and turn, red for running lights and white for ...
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How do I decode BMW CAN data (over OBDII)

I'm using an ELM327 type device. I'm trying to poll and decode data on my BMW i3. I'm using some of these resources as a reference: This post breaks down the init I need to do. This further post ...
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Central locking in Mercedes-Benz Vito W639 is temperamental when GPS is attached to central locking

I have a fleet of vehicles (Hyundai, Mercedes, Toyota, Volkswagen, Honda) all which have a GPS tracking device attached to their OBD2 port. Of this fleet, a subset of the vehicles are Mercedes-Benz ...
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Is there a non-USB-OBD2 adapter made for reprogramming (CAN/ISOTP)?

I'm working on an ECU reprogramming and coding app (iOS, Android, etc.) for a client who is part of the automotive tuning scene. I have been trying out dozens of OBD2 adapters, but most of them fall ...
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Cannot connect to gateway node of CAN bus through OBD2 port

I wanna connect to can bus of my car. I read in the manuals that obd2 is hooked to high speed can bus of something called CCU node and this CCU node acts as gateway between HS and LS canbus. When i ...
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Can an OBD2 tester do a battery load test?

This Autophix device device was suggested by a review as the best of five battery testers. The text implied that includes testing cranking amps. But it can only connect to the computer—has no way to ...
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Wireless control of trailer board lights

Is there a (Bluetooth?) OBD module that can transmit to a receiver that remote controls a car trailer board lights ? I have seen the magnetic bluetooth "stick on lights" that are powered by ...
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-1 votes
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Clear OBD-II codes automatically? Either with sollid-state device or smartphone app/widget

Been using an ELM327 adapter with various apps to clear OBD-II trouble codes. While this works, wondered if there is an app or device which can do the following without intervention: Clear all obd-...
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What does OBDII fault code P0120 really mean?

What does OBDII fault code P0120 mean? The device said: "TPS/Pedal Position Sensor A Circuit Malfunction". The problem is that TPS stands for: "Throttle-body Position Sensor, which sits ...
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1 vote
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2006 Honda Civic Hybrid, error lights on dash, and codes

A few months ago, my Civic Hybrid started giving me issues. When I start it in the morning, I have to hold the key for a few seconds before the engine catches. Once the engine is running, my IMA light,...
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Would OBD-II devices drain the battery when used 24/7?

There are many OBD-II devices out there that can scan and/or monitor real-time data about your car. Most of these devices are readable via USB or Bluetooth. Either USB or Bluetooth, both require some ...
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1 vote
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How does a OBD II misfire detection monitor know "exactly" which cylinder is misfiring?

I do know that magnetic pick-up coils are used to detect crankshaft position and these sensors are used to tell which cylinder is misfiring. These magnetic pick-coils do not produce a smooth & ...
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how to check car for impending failures? [closed]

My kia Sorento 2007 failed on me multiple times. Each time disabling the car and putting the driver in danger harmonic balancer alternator radiator and water pump in each of those failures, I had ...
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OBD2 for car customization

i was wondering if it could be possible use CAN protocol to automate some of my car (Suzuki Swift 2016 1.3 DDiS) processes, such as close windows when door get locked. I found lot of applications/...
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Run a forced DPF regeneration using OBD-II diagnostics

Our Jeep Grand Cherokee 2015 has problems with its exhaust filter. The error says we should drive safely at highway speeds to remedy but even after driving a few hours, it does not recover. It is ...
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What is typically involved to repair a internal combustion engine that has a cylinder misfiring?

I have a vehicle with a cylinder misfiring (according to my OBD-II code reader). I have decided to have a mechanic repair it, as I have never performed a similar motor vehicle repair. Note that the ...
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1 vote
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2009 Volkswagen Jetta TDI diesel 2.0L

I have 2009 Volkswagen Jetta TDI diesel 2.0L, they saying this car required CAN bus system instead kwp2000. My question is: How does the protocol Id change? Maybe ECU is defective? Some people told me ...
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P0491 Secondary Air Injection System Insufficient Flow. Stumped

My VW CC 2010 is having a CEL with the code P0491 which means the pressure sensor is not detecting enough air being pumped from the intake into the exhaust. No other codes. No problems since this is ...
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OBD-II Scanning Bluetooth | Are Fault Codes Encripted?

I bought JDiag Fastlink OBD II scanner which is based on ELM327 based OBD II scanners. I noticed that the scanner was able to read all the instrument panel reading such as fuel level, engine ...
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Increase volts at OBD port

My fixd scanner only says low voltage. How can I increase the volts at OBD connection my check engine light is on trying to get code. 1999 GMC Sierra 2500 with a 5.3 litre Vortec engine Scanner ...
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Are OBD-II devices capable of controlling acceleration and top speed of a car? [duplicate]

I have been searching for a while for some specific type of OBD-II devices that can, besides performing the usual diagnostics, also do the following: GPS track the car online Has the ability to set ...
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Will my car pass emissions if all monitors pass scanner except EVAP monitor

I had toyota remove a P code off my 2010 1.8L corolla after a repair. I need to pass emissions in Arizona in the next 2 weeks. I went to AZ and they let me borrow the scanner so I plugged it and ALl ...
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What is "transmission slip ratio" and is it normal to have anything other than 1.0?

I got a 5.4 Ford econoline 1998 edition. I got me a odb2 code readin app with the bluetooth on it... and I also paid extra to unlock the premium Ford specific data... all kinds of stuff in there. In ...
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Is it possible to clear "permanent codes" on a Volkswagen Jetta?

I was inspecting a 2011 Volkswagen Jetta today and saw on my OBD reader that it had two misfire codes, if I remember correctly P0302 cylinder 2 misfire and P0300 multiple cylinder misfire. The check ...
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Feelin' a misfire but ain't showng no misfire in the computer

I swears when I turn on my van just sitting there I feel a misfire more often than any good person should. In my opinion, I shouldn't be feeling any weird shakin or nothin. When she's been driven a ...
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