# Is this PR4 ECU an obd0, or obd2?

**URL:** <https://forum.g2ic.com/t/is-this-pr4-ecu-an-obd0-or-obd2/84832>\
**Category:** Electrical & Entertainment Systems\
**Created:** [December 9, 2008, 12:50am UTC](https://forum.g2ic.com/t/is-this-pr4-ecu-an-obd0-or-obd2/84832 "2008-12-09T00:50:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ninezeroteg](https://forum.g2ic.com/letter_avatar_proxy/v4/letter/n/91b2a8/32.png) [@ninezeroteg](https://forum.g2ic.com/u/ninezeroteg)\
**Post date:** [December 9, 2008, 12:50am UTC](https://forum.g2ic.com/t/is-this-pr4-ecu-an-obd0-or-obd2/84832/1 "2008-12-09T00:50:20Z")

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I just got an ECU off ebay that was listed as an obd0 PR4, but it doesn’t have the diagnostic led in it like the one in my 90 teg has… Is this an obd2 PR4?

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**Author:** ![HrhMax](https://forum.g2ic.com/user_avatar/forum.g2ic.com/hrhmax/32/77_2.png) [@HrhMax](https://forum.g2ic.com/u/HrhMax)\
**Post date:** [December 25, 2008, 12:30am UTC](https://forum.g2ic.com/t/is-this-pr4-ecu-an-obd0-or-obd2/84832/2 "2008-12-25T00:30:55Z")

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OBD-I

To read codes from it you short the appropriate jumper under the glove box and read the flash sequence from the CEL instead.