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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2k views

obtaining Remaining Fuel Level from a 2004 VW Polo (Mk4)

If I have a 2004 VW Polo and this uses a K-Line Bus (I think), how can I retrieve the fuel Level in the tank if the information is not made available as part of one of the standard OBDII PIDs (I think ...
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2answers
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VW Golf IV Possible Engine Misfire

I guess I better start with a few details on the car in question: VW Golf IV 20 valve V5 petrol engine (2.3L) ~80k miles on the clock Now the problem, it feels to me as if the car is down on power, ...
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134 views

Developing an OBD2 application - Engine Warning Lights

I am currently developing an application which retrieves diagnostic trouble codes from my car's OBD system and display any DTCs in a list. However, as my car has no trouble codes I am unable to test ...
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1answer
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Can the OBD port be used to disable the car alarm?

My car alarm (2007 Mercury Mariner) has been going off uncontrollably at all hours and my neighbors are furious. I cannot afford to take it to the dealer, who wants hundreds of dollars to even look at ...
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1answer
507 views

Where can I get a comprehensive list of GMLAN Symptom category codes?

GM and several other manufacturers have added additional information to the 5 digit codes. These are not “codes” but are “Symptom categories”. The DTC symptom is made up of an additional 2 digit ...
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2003 Honda Accord Crank But no start

I did something really silly last night :( - I have a 03 Accord V6 sedan that I recently changed the transmission. After I hooked up the new tranny etc.. I noticed when I start the car the SRS, (!) ...
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1answer
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Does OBD II pin 16 output is always 12 Volt?

Does OBD II pin 16 output is always 12 Volt? Is it possible to the voltage is altering when ignition on, like rising from 12 to 14 Volt? Or Voltage output of the buses, trailers, heavy duty vehicles ...
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657 views

What kind of DLC did Toyota's have before switching to OBDII?

What kind of DLC did Toyota's have before switching to OBDII? What year did they switch to OBDII outside the United States?
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(Mandatory in the EU) CAN through OBD-II?

I know that in the US, since 2008 vehicles must have a CAN connection on the OBD-II plug, but what about Europe? Do vehicles have to add CAN to the OBD-II plug? Or is it possible to directly send ...
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What OBDII protocol does a 2014 Mitsubishi Outlander use?

I was trying to help out a friend with an intermittent stalling issue, but the OBD Fusion app could not connect to it via my ELM327 Wi-Fi adapter. The protocol setting was set to "Automatic", which I ...
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Engine Temperature from OBD data

Engine Coolant temperature is obtained from OBD. But there is no PID to get engine temperature. Obviously, they are related, rather proportional I guess. But can there be a case where my engine is ...
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Can the throttle position be high during idle

I used an OBD to get data from one of my friend's car - Volkswagen Polo 1.5L Diesel. But the car was idling at around 900 rpm, while the throttle position I got was around 22%. How is it possible? As ...
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542 views

Quick Oil Change place overfilled my BMW Z3

Just got this car, a BMW Z3 3.0 from a Tampa dealer and have not even had it 10 days and Check Engine Light came on. I wanted to get the oil changed to full synthetic just in case it wasn't and ...
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Can an ELM327 OBD-II reader report on anything other than engine trouble codes for a Mini Cooper?

My car (Mini Cooper S) has a service light and tire pressure light on, so I was expecting my new OBD reader to tell me what they were about, but it just says "0 confirmed emissions-related DTCs ...
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2answers
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Why does my VW diagnostic codes give “Implausible Signal”?

I asked a question some time ago about a check light, specifically airbag and seatbelt light. I have since then checked the code with a code reader and removed it. Making the car drive without any ...
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How can I rev a “drive by wire” car from under the hood?

I've got a 2013 Hyundai Accent with a noise coming from somewhere under the hood. Happens only at a fairly narrow band of engine speed (1100-1200 RPM). I've been trying to hunt around for the source, ...
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OBD2 CAN Protocol: ISO 15765-4

I understand that one of the CAN protocol that OBD2 uses to read vehicle data is ISO 15765-4. However this is the one that is used by generic OBD2 reader devices like ScanTool; And it provides a ...
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616 views

Does a CEL always result in an OBDII DTC?

Will any error which causes the check engine light to go on show up as a DTC during a regular OBDII scan? This is obviously only in relation to OBDII compliant vehicles. EDIT July 26th, 2016 So I ...
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1answer
443 views

What is SAE 0x15 Short Term Fuel Trim Bank 1 Sensor 2?

I was taking a look at a neighbor's car, and noticed this PID stuck at 99.22% This is in addition to the regular STFT PID 0x06 which is staying fairly close to zero most of the time. What is this ...
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882 views

Calculating AFR using injector flow rate and mass air flow

Is injector flow rate = Mass fuel flow? If so then AFR = MAF/Injector flow rate. Can someone please confirm this?
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1answer
201 views

How do I get the most out of a “smart” OBDII scanner?

I recently purchased an OBDII scanner that allows me to read and log data using my tablet. How do I get the most out of this device? I am already familiar with simply reading the trouble codes to ...
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Mini Cooper P1638 code

I have a 2007 Mini Cooper. It keeps throwing code P1638 on my code reader on these really really cold mornings, and the engine seems to search for idle, reving betwween 500RPM and 1400RPM. The car ...
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1answer
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What is the OBD-II drive cycle for a 2003 Toyota Corolla?

This site includes a post with the specific drive cycle that resets the OBD-II monitors on several 2000-2002 Toyota vehicles. What does the drive cycle look like for a 2003 Toyota Corolla?
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241 views

OBD2 Mode 1 PID 12

What are the meanings of the returned values for OBD2 Mode 1 PID 12? One source shows me A0 Upstream of catalytic converter A1 Downstream of catalytic converter A2 From the outside ...
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Mini-VCI J2534 cable question

I purchased a mini-vci j2534 and I cannot get it to work with any of the ODBii software I have. I cannot read a honda, nor 2 chevy's. Is this cable ONLY for toyota programming software? I do have a ...
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Mode 06 approaching failure limit

In Mode 06 (OBD), one gets a current value, max value and a min value for every MID, TID supported. If the current value is out of the max/min range, that MID, TID is considered a 'Fail'. But there ...
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596 views

Android App for ELM 327 that allows to reset codes for Cadillac CTS

On my Cadillac I get engine light to come up because I have changed my petrol cap and sensor is malfunctioning. I got myself wifi ELM 327 OBD-2 reader, and by using my laptop I managed to get RPM of ...
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300 views

Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
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BMW E90: Coming Home automatically on darkness

I have a BMW E90 ( pre- facelift ) with light package . Currently my car is set so that the " Coming Home " function can by pressing the headlight flasher is switched off, press at ignition . My ...
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Acceleration problem, but only immediately after stopping

Symptoms: The following applies mainly when accelerating from zero speed at 1st gear in RPM below 2500. Above that RPM range, there is no problem (then acceleration is assisted by turbo-compressor). ...
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Integrating Fast OBD Readings and GPS

I'm working on a project to look at fuel consumption on different roads and I need the OBD reader to log the GPS coordinates every time it takes a reading. I'm looking at instantaneous fuel ...
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Unable to connect OBD2 scan tool

Cheerz, I have purchased recently OBD2 scan tool(Autel MaxiScan MS300) which supports ISO9141. My car (Mitsubishi Lancer GLX 1.3 1999) seems like ODB2 compatible using ISO9141-2 protocol for ...
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11answers
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Is it safe to get power from OBD 2 port for dash cam?

Most dash cams don't have a large enough battery to record while the vehicle is off so most people recommend using an external power bank. However, to my understanding, most power banks with enough ...
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2answers
4k views

OBDII ELM 327 Bluetooth adapter - is it reliable? [closed]

I got myself such a bluetooth adapter for my car, because the display on the radio stopped working, and I wanted to see if it will show up any errors. There are even apps for Android that work with ...
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1answer
335 views

Can we determine the Cleaning Requirement of Air Filter Using OBD

Many a times, the dealer guy says that the unclean air filter consumes more fuel as compared to clean. So, my question is, is this really related to air filter? If yes, can we determine the case using ...
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258 views

Is there a viable option for updating OBD-I to OBD-II in order to increase possibility of engine tuning?

I've been told this is a terrible idea and just wanted greater confidence even though the warning against has been taken. I want to be able to fine tune a 1990 car with an OBD-I port in addition to ...
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1answer
3k views

How to Reverse engineer the manufacturer specific protocol on OBD2 for acquiring enhanced vehicle data

I understand that generic OBD2 readers gives a limited set of vehicle data (PIDs). Enhanced set of vehicle data could be aquired via the protocols which is car manufacturer specific (not published). ...
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517 views

Need explanation on Commanded EGR and ethanol%

There are 2 PIDs listed in this Wiki page - Commanded EGR and ethanol%. I have tried getting the values from some cars but have not succeeded. I am curious to know what do these 2 PIDs mean? Can ...
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2answers
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Gear ratio from speed and rpm

https://stackoverflow.com/questions/30017271/obdii-determine-gear-given-speed-and-rpm Referring to the above link, one method to find the current gear ratio is to calculate Speed/rpm (The rpm is the ...
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3answers
14k views

Failed inspection on because of OBD2 readiness

My 2008 Hyundai failed inspection because the OBD-II system is in a "not ready" state. The mechanic asked if my battery had died recently. It had, after getting an alignment. He suggested driving on ...
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3answers
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P0420 in a Prius

EDIT #2: I rescanned, looking at the correct data, and found the rear O2 sensor was definitely bouncing up and down with the forward sensor's lambda reading. Since I have looked for leaks and couldn'...
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1answer
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What does error code: POO13 mean?

My vehicle: Saturn VUE 2008, 2WD 4Cylider. Checking light is steady on. Read code at auto zone store, POO13. The mileage is only 45K. I have no idea. Thanks for advice.
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1answer
233 views

Can I trickle charge battery through OBD2 port 2007 civic

Trying to determine if 2007 civic OBD2 port is live with key off so I can trickle charge with a solar panel
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BMW - Reading fault code without OBD reader

OK - this is frustrating. It was dead simple to read the error code on my old 323i using the button on the stalk. I recently bought a 2014 328i xDrive and for the life of me cannot find a way to ...
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3answers
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Volvo S40: Identify cause of alarm triggering

2005 Volvo S40 with about 100k kms. Every once in a while, usually after I've just parked the car, exited, and locked it, the alarm will go off. I understand there is a common issue with these ...
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OBD-II Mode and PIDs specifically used for Electric vehicles?

I am working on developing a vehicle CAN communications protocol being implemented in an electric vehicle. I was wondering if anyone knew if there is a standard MODE and PID for OBD-II messages ...
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476 views

How can I troubleshoot a U0208 DTC code on a 2009 Land Rover LR2? [closed]

How can I troubleshoot a code U0208 on a 2009 Land Rover LR2? It has a 3.2L engine. Thanks!
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2answers
125 views

OBD reader returning “0 Codes” way too fast?

Normally, when I read my '07 Hyundai Sonata, the reader takes about 10 seconds and then returns "0 Codes" (or whatever). However, I just was checking out a 2010 Sonata. I hit Read and it popped up "0 ...
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1answer
814 views

P2104 Throttle Actuator Control System Forced Idle error, but car runs fine

2 days ago, I had to jump start my 2009 Chevrolet Aveo. I suspect I left the interior light on all night which drained the battery. After I started the car, the engine warning indicator was on. (It ...
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3answers
86 views

Auto determine the bluetooth device is OBD or not?

Current I am working on OBDII. While in bluetooth discovery to connect obd, How I determine which device is obd and which device is normal bluetooth device.Because I want auto connect my app with obd. ...

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