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Old 08-31-2008, 12:54 PM   #1
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OBD I vs. OBD II

Hello all,

My dad had a 1990 YJ while I own the 2000 TJ.

My friend says that the OBD Is are far better than the OBD IIs because they are far easier to modify and aren't as sensitive and finicky as the OBD IIs.

My TJ is an OBD II. Which OBD do you prefer or feel is better?

Just curious. O yea, aren't OBDII more efficient and smooth?

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Old 08-31-2008, 01:34 PM   #2
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doesn't have much to do with how it runs. in my area they just eliminated emissions testing on obd1 cars, i prefer them for modification reasons and so on. obd2 can be easier to diagnose problems, the computer system is far superior for that. obd1 codes don't always tell you much, obd2 codes are much more straight forward. obd 2 vehicles are more strict on emissions, so you're gonna get more o2 sensor, catalytic converter, evap and so on failures.

fyi, obd stands for On Board Diagnosis.

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Old 09-03-2008, 10:51 AM   #3
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It's my understanding OBDII is universal and is not a proprietary system. Meaning, any mom and pop shop can pull the codes and you do not have to go to the dealer (unless you want to).

I believe this was a federal mandate that all domestic manufacturers need to comply with.
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Old 09-03-2008, 02:19 PM   #4
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Any vehicle sold in the US after 1994 has an OBDII system. Just for the reason you said, easier to diagnose as newer computer systems in cars are becoming more and more complex. You can even check the codes on your TJ without visiting a shop.
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Old 09-03-2008, 03:44 PM   #5
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Quote:
Originally Posted by AzTJ View Post
Any vehicle sold in the US after 1994 has an OBDII system. Just for the reason you said, easier to diagnose as newer computer systems in cars are becoming more and more complex. You can even check the codes on your TJ without visiting a shop.
it was federal law that all vehicles from 1996 and on are obd 2. mainly has to do with emissions, and also so manufacturers couldn't monopolize the obd systems, by using dramatically different equipment that independent shops couldn't have access to.

in illinois emissions is now tested just by plugging in to the obd 2 port on your car.
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Old 09-03-2008, 09:37 PM   #6
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'94 or '96 I'm not sure... lets just say '95. But yes, it's a combo of reasons.
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Old 09-03-2008, 09:45 PM   #7
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definately 96, i have to deal too much with emissions.

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