4 ms·

Don't all or nearly all modern vehicles use OBD-3?

core-utility 5y ago
My 2017 and 2018 vehicles have OBD-II
bri3d 5y ago
There is no such thing as OBD-3 currently. All cars sold in the US since 2008 use ISO 15765-4 OBD over CAN for emissions diagnosis, and almost all use ISO 14229 UDS for manufacturer/dealership diagnosis.
- kube-system 5y ago
  Not sure which particular protocol(s), but OBD-II was generally required for all cars from 1996 up in the US for emissions testing purposes.
  - bri3d 5y ago
    Prior to 2008, OBD-II had several allowed wire protocols - SAE J1850 PWM (Ford), SAE J1850 VPW (GM), ISO 14230 KWP2000 (most other vendors), or ISO 15765 (OBD over CAN). In 2008, the US requirement switched to exclusively ISO 15765 OBD over CAN.
- PaulHoule 5y ago
  https://straighttalkautomotive.com/articles/have-you-heard-of-%20obd-iii.html https://straighttalkautomotive.com/articles/have-you-heard-o... The intent of OBD-III is to use some kind of wireless mechanism to notify the state that your check engine light is on. In California, for instance, you have to pass a smog check every six months, so people driving four months with a failed emission control system are contributing a lot of emissions. It's been hung up forever because of privacy concerns, fears about rent seeking (being forced to buy a cell phone plan for your car), etc. These sort of applications https://www.nhtsa.gov/technology-innovation/vehicle-vehicle-communication https://www.nhtsa.gov/technology-innovation/vehicle-vehicle-... are also hung up indefinitely because the cell phone industry is pushing "secure" solutions that involve cellular infrastructure but not promising to invest enough in their network to cover all the places you might want them. That and the rent seeking, privacy, etc.
  - gabrielsroka 5y ago
    > In California, for instance, you have to pass a smog check every six months I live in California and you only have to do it every other year [0]. My car is almost 30 years old, not super well maintained, and it's never failed. [0] https://www.bar.ca.gov/Consumer/Smog_Check_Program/FAQ https://www.bar.ca.gov/Consumer/Smog_Check_Program/FAQ
    - lotsofpulp 5y ago
      If your car has a check engine light on, you can also unplug the battery overnight, connect it in the morning, drive 40 to 70 miles in a mix of city and highway conditions, and take it immediately to the inspection station before the check engine light comes on. There is usually a window between when the car will report there is not enough data to pass the emissions test, and when the car reports a failure of the emissions test. Maybe try unplugging the battery every night for a week and you can get a good idea of when you can get it inspected and passed.
      - elygre 5y ago
        Or just fix your car.
        sokoloff 5y ago
        That's what most people do for a repeatable issue, but there are "gremlin cases" where a car in otherwise good repair will somewhat randomly set a MIL code. Wife's 2005 CR-V will around once per year set P0325 (knock sensor, bank 1). I've replaced the knock sensor [twice], rang out the wiring, and checked/cleaned all the connectors. It's a 17.5 year old car with ~225K miles on it that sets a code once a year. It's not going to get any more fixed than it already is.
        lotsofpulp 5y ago
        Catalytic converters are an expensive fix. It might not be worth it to fix the car. Alternative option is to sell the car to someone in a state that does not require emissions testing. Also, if someone steals your catalytic converter, and there is not much damage, it is possible to “straight pipe” it for cheap and just not put in a catalytic converter. Although, I would assume inspection stations have cameras or mirrors where they can see the bottom of the car, so this might only be worth it in states that do not do inspections.

My 2017 and 2018 vehicles have OBD-II

There is no such thing as OBD-3 currently. All cars sold in the US since 2008 use ISO 15765-4 OBD over CAN for emissions diagnosis, and almost all use ISO 14229 UDS for manufacturer/dealership diagnosis.

kube-system 5y ago
Not sure which particular protocol(s), but OBD-II was generally required for all cars from 1996 up in the US for emissions testing purposes.
- bri3d 5y ago
  Prior to 2008, OBD-II had several allowed wire protocols - SAE J1850 PWM (Ford), SAE J1850 VPW (GM), ISO 14230 KWP2000 (most other vendors), or ISO 15765 (OBD over CAN). In 2008, the US requirement switched to exclusively ISO 15765 OBD over CAN.
PaulHoule 5y ago
https://straighttalkautomotive.com/articles/have-you-heard-of-%20obd-iii.html https://straighttalkautomotive.com/articles/have-you-heard-o... The intent of OBD-III is to use some kind of wireless mechanism to notify the state that your check engine light is on. In California, for instance, you have to pass a smog check every six months, so people driving four months with a failed emission control system are contributing a lot of emissions. It's been hung up forever because of privacy concerns, fears about rent seeking (being forced to buy a cell phone plan for your car), etc. These sort of applications https://www.nhtsa.gov/technology-innovation/vehicle-vehicle-communication https://www.nhtsa.gov/technology-innovation/vehicle-vehicle-... are also hung up indefinitely because the cell phone industry is pushing "secure" solutions that involve cellular infrastructure but not promising to invest enough in their network to cover all the places you might want them. That and the rent seeking, privacy, etc.
- gabrielsroka 5y ago
  > In California, for instance, you have to pass a smog check every six months I live in California and you only have to do it every other year [0]. My car is almost 30 years old, not super well maintained, and it's never failed. [0] https://www.bar.ca.gov/Consumer/Smog_Check_Program/FAQ https://www.bar.ca.gov/Consumer/Smog_Check_Program/FAQ
  - lotsofpulp 5y ago
    If your car has a check engine light on, you can also unplug the battery overnight, connect it in the morning, drive 40 to 70 miles in a mix of city and highway conditions, and take it immediately to the inspection station before the check engine light comes on. There is usually a window between when the car will report there is not enough data to pass the emissions test, and when the car reports a failure of the emissions test. Maybe try unplugging the battery every night for a week and you can get a good idea of when you can get it inspected and passed.
    - elygre 5y ago
      Or just fix your car.
      - sokoloff 5y ago
        That's what most people do for a repeatable issue, but there are "gremlin cases" where a car in otherwise good repair will somewhat randomly set a MIL code. Wife's 2005 CR-V will around once per year set P0325 (knock sensor, bank 1). I've replaced the knock sensor [twice], rang out the wiring, and checked/cleaned all the connectors. It's a 17.5 year old car with ~225K miles on it that sets a code once a year. It's not going to get any more fixed than it already is.
      - lotsofpulp 5y ago
        Catalytic converters are an expensive fix. It might not be worth it to fix the car. Alternative option is to sell the car to someone in a state that does not require emissions testing. Also, if someone steals your catalytic converter, and there is not much damage, it is possible to “straight pipe” it for cheap and just not put in a catalytic converter. Although, I would assume inspection stations have cameras or mirrors where they can see the bottom of the car, so this might only be worth it in states that do not do inspections.