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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5k views

Classifying a DTC as active, past or potential

Scantools always classify a DTC as active/current, history/past, potential/memory. How do they classify that? Sample raw data: 80 F1 5A 05 58 01 C1 00 20 0A Can you help classify it as past, ...
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6answers
29k views

Can retail OBDII scanners “kill” my car's ECU?

I have a run of the mill OBDII scanner from Amazon. I connect it to my phone's (Android) app, Torque PRO, via Bluetooth. I have been using it for 22-months. No problems whatsoever. My car never ...
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4answers
211 views

What good is a scan tool?

Other than reporting error codes, is a scan tool useful? Can it help you to tune the car to optimize gas mileage for example or other helpful things?
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3answers
286 views

Can reading from the ODB port interfere with a custom STO map?

I recently had a full freeflow system fitted to my Opel/Vauxhall Astra Turbo Coupe. Along with this, I had a stage 1 STO map done to take full advantage of the new exhaust characteristics. At any rate,...
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5answers
4k views

Torque App Mileage reliability?

I am using an OBD-II sensor and the Andriod Torque app to look at my fuel economy and see that it shows a whopping 37 MPG for my Mazda 6, 2005 (2.3 Automatic). This seems fishy as some random googling ...
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1answer
88 views

Is OBD II is still relevant or does it have a future?

I am thinking to invest and buy an OBD-II scanner. Before I do that, I need to know for how long automakers will comply and support OBD-II standard. I am asking since I am planning to buy a 2019 ...
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1answer
27 views

Are “incomplete monitors” and “cleared codes” the same thing?

I have heard both usages. I guess that they are the same thing but wasn't exactly sure.
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2answers
1k views

Can I turn the steering wheel in Honda Civic 2017 (No Honda Sending) by sending commands via CAN bus (OBD ii port)?

I want to turn steering wheel my 2017 Honda Civic LX (without Honda Sensing) by sending commands via CAN bus (OBD ii port), My car has Electronic power steering. I am doing this because I need to some ...
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2answers
1k views

What data are OBD-II scanners capable of logging?

I've been reading that certain scanners are capable of logging data that can be recorded while driving. What sort of data are most popular to be recorded? Can someone comment with examples of data ...
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1answer
59 views

Tacoma inducing monitors after resetting ECU

My 2006 Toyota Tacoma had a check engine light, which I decided to try to turn off for the purposes of vehicle inspection. I thought that was okay because the problem was not emission-related but ...
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1answer
39 views

Siemens sim2k-34vr ecu parametrs and service ids

I need to read parametres like RPM of the engine from siemens sim2k-34vr ECU from obd2 port through K-line protocol,I tried standard service id 0x01 to read current data but ECU said 0x01 service id ...
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2answers
1k views

Calculating fuel flow rate through obd || sensor not supporting 015E and 0110 commands

I have been working on a project where i want to calulate fuel flow rate using data from the obd2 sensor. The car on which i was testing didn't support the pid 015E which is for fuel flow rate. Then i ...
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3answers
526 views

Is obd code P0133 anything to worry about?

The day before I got this obd code I changed clutch and gear box oil. 15 minutes before I got this code one of my brakes pads completely wore out. I read a bit about the code and I guess they are not ...
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1answer
870 views

Can i control the brakes of a car by the OBD II Interface?

I'm doing a senior project about automating the braking system in cars and make it smarter
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2answers
1k views

OBD-II Fuel type and level of Monofuel Cars

I'm making an application like Torque and i have some issues with commands of Fuel Type and Fuel level with cars that use only one type of fuel like, Only Diesel or only gasoline. With car Bifuel ...
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2answers
8k views

Is the Calibration Verification Number (CVN) unique

Is the Calibration Verification Number (CVN) unique across all cars?
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2answers
694 views

Can OBD2 devices send car alarm to a smartphone app?

I’m new about cars and would like to know if OBD2 devices like ELM327 are able to send the car alarm to a smartphone app, like Torque or OBD Car Doctor. So, instead of the car alarm making noise, the ...
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2answers
4k views

Are there any OBD scan tools compatible with a Volvo V50 2005 Europe

I understand this is not a website to ask for specific products. I have spent nearly 3 hours on the web trying to find a scanner that will be able to read and erase codes from my Volvo V50 2005 Europe ...
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1answer
1k views

Auxiliary input status and Auxiliary input / output supported OBD2 PID

I want to know what does Auxiliary input status (PID 1E) and Auxiliary input / output supported (PID 65) OBD2 PID mean. Do they tell me whether my car is in the Aux mode (while I am listening to the ...
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2answers
83 views

linking a phone to a car via OBD-II and Bluetooth: Automatic (1st gen) in Europe [closed]

I am relocating to Europe soon, and I'm pretty sure my new car would have OBD-II. Why is Automatic adamant their current product is for the US only? Is it a regulatory issue, or something technical ...
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1answer
176 views

Where and how to find compatible OBD bluetooth adapter

I need a bluetooth OBD adapter compatible with Hyundai Sonata 2002 2.0 Automatic UK. I don't know much about cars and hence ending up asking for help. I would appreciate if someone can inform me where ...
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1answer
2k views

After odometer/mileage correction, which module data gets changed - engine or instrument cluster?

I read that the PCM tracks mileage for it's own purpose and BCM tracks and stores it for instrument cluster module to display it. So, when someone does an odometer/mileage correction, does it change ...
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1answer
4k views

Calculating current fuel level with obd data

My car does not provide the fuel level data to the obd. this is the data the car do provide: engine coolant temperature, engine load, ambient air temperature, engine rpm, intake manifold pressure, air ...
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3answers
652 views

Are there any affordable OEM scan tool options for DIY-ers? [closed]

Every scan tool I've seen offered to consumers only provides basic OBDII or CAN data. Some only offer the ability to view basic stored codes, and maybe a freeze-frame capability. This $20 scan tool ...
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1answer
2k views

Seat belt / airbag light ON polo 2013

Hello I have a polo from 2013. I just inherited it from my grandfather, whom has not driven it that much. Most of the time it has been in garage. Only done 28.000 km After I got it a lamp started ...
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1answer
2k views

How to detect Passenger Seatbelt Indicator using OBD2

I have trouble code information as below for B00D1 OBD Trouble Code which use to detect Passenger Seatbelt Indication. I am referring below links to get trouble code information: http://www....
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1answer
3k views

Toyota Fortuner OBD2 protocol

I used an ELM 327 and Torque app in one of my friend's Toyota Fortuner (2012 model), but didn't get correct data. Rpm was nil, Air intake temperature was negative, Load was constant at 6.66667%. After ...
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1answer
109 views

How can I tell if I would benefit from higher octane fuel?

Given the number of variables involved in whether an engine will knock on a given fuel in a given environment: How can an end user determine whether the engine is retarding timing due to fuel octane? ...
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2answers
2k views

ECU signals to CAN bus

What methods or ideas are out there that can match or change an SR20det ECU's signals or codes in order for a newer CAN bus system to read, for example, the power steering to work as well as the ...
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1answer
2k views

Reading CAN messages through UART to OBD-II Board and MATLAB Toolbox

I want to read/write CAN messages. I have MATLAB in my laptop which has a Vehicle Network Toolbox which supports reading/writing CAN messages. I have my hardware OBD-II to UART board, FTDI and OBD-ii ...
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2answers
73 views

Manually starting MIL(Malfunction Indicactor Light)

I want to know how can i manually start my Malfunction Engine Light (Check Engine Light) ? i actually want to generate a DTC so that i can see it on a OBD Scanner. I know even altering or removing/...
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1answer
106 views

Is there a smog abatement program for repairs greater than a certain amount in california?

I just bought a used car, and I'm going to get it smogged soon. Apparently (this is what the mechanic said), I can't get it smogged until 2 "checks" turn on. I think this means that the check engine ...
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1answer
2k views

1998 Ford Contour P0171 P0174

I have a 1998 Ford Contour that has a check engine light. I checked the codes, and found: P0171 System Too Lean (Bank 1) P0174 System Too Lean (Bank 2) P0401 Insufficient EGR Flow P1131 Lack of ...
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1answer
12 views

OBD2 Scanner can not detect ECU 2002 Mitsubishi Lancer

I bought a OBD2 Bluetooth scanner online. However, when I connect it to the OBD2 port in the car, the app while connecting to the OBD2 scanner gives an error message that it cannot connect to the cars ...
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1answer
86 views

Why does my OBD2 scanner not reset the errors as well as a mechanics?

My car has an intermittent fault that cannot be fixed. It has been to the garage so many times now and they cannot find the fault. I figure there is no point putting more effort into trying to fix ...
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1answer
78 views

What to look for when buying an OBD-II scanner?

I'm looking into buying an OBD-II scanner for my vehicles, but it seems there is more to consider than I initially thought. I had assumed that any OBD-II scanner would be able to read and clear codes, ...
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1answer
61 views

How can I test alternator

The voltage of my car battery is not fixed when AC going to active. In fact, I saw that the voltage dropped when the compressor clutch turns on. I suspect alternator and battery. Now I want to test ...
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1answer
43 views

Use OBD to check car status

i wanted to know if it's possible to use a cheap OBD scanner connect the car to a computer and see the status of the locking system, if the car is locked or not, i dont want to change or send orders ...
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1answer
43 views

How can I understand which will my car needs new sparkplugs? by ODB

I have bought an OBD2 Android. I saw many parameters in that. I was confused. But I want to know which will my car needs new sparkplugs? of course by OBD parameters.
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1answer
93 views

Re-wiring OBD port

I was reading online about thieves 'hacking' the OBD2 port on push button start vehicles and there seems to be little discussion around OBD2 port locks or moving OBD ports. I was wondering if any has ...
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1answer
900 views

IAT reading higher than ambient temp. Is that normal?

My car's engine comes with a Bosch hot film airflow mass meter. The probe inside the sensor's body features both the actual airflow sensor and what looks like a thermistor. I'm telling you that ...
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1answer
109 views

How frequently can I poll OBDII monitor codes?

I'm interested in realtime information for the MONITOR_VVT_B1 and MONITOR_MISFIRE_CYLINDER_(1|2|...) monitor codes. I would poll them about once a second, maybe slightly more frequent. Is it ...
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1answer
316 views

Can I use a BMW round 20 pin to OBD II adapter with a OBD II scanner?

I'm looking to buy an e30 or e36 BMW and 99% of those don't have an OBD II port because they were made prior to 1996 but they all have the BMW round 20 pin I believe. I came across this adapter:and I ...
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1answer
80 views

Ca. Smog Test Problem

I took My 2000 Dodge Durango 4.7 engine to get it smog tested in Ca. The tester tried at least 3 times to communicate with my OBD syst. with no success. He then took my truck off the machine and ran ...
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2answers
668 views

OBD2 mode 3 wrong response

I'm a research engineer working on OBD2 scanner, I'm using ELM327 v1.5 interface to communicate with cars. I used Dacia Logan 2013 (French car) to test OBD2 modes, the MIL indicator was ON. When I ...
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1answer
335 views

1995 VW Eurovan OBD I to OBD II adapter

My 1995 Eurovan has a check engine light coming on. I have a standard OBD II reader but this vehicle requires a OBD I reader. I see they sell OBD I to OBD II adapters online but I have read that with ...
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1answer
265 views

Open source OBD II scanner hardware without ELM or STN

We have built an OBD-II scan tool using an STM32 microcontroller and it works for most vehicles. But occasionally our device fails to detect the OBD protocol, whereas the OBD scanner (ELM) will detect ...
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1answer
5k views

Calculate boost from MAP Sensor via OBD-II

I'm working on a little project where I want to calculate the boost pressure (in bar) which my turbo currently produces. I use a wifi OBD reader that I plug into my car. I saw mobile apps calculating ...
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1answer
107 views

CAN-BUS only reading one repeating frame

I'm trying to read the CAN-BUS via the OBD port with a PiCAN, it works fine for one of our cars. But for the other (a 2007 Mini One) I'm just getting the same frame repeated until the bus is ...
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1answer
2k views

What is the drive cycle for OBD-II equipped GM vehicles?

As the title states, what do I have to do to get through the drive cycle for OBD-II equipped GM vehicles?

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