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are there two different p28?

Discussion in 'ECU's, Electronics, and Tuning' started by 89honda90, Aug 10, 2003.

  1. 89honda90

    89honda90 Junior Member

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    i saw somewhere that two different p28 where listed. one didnt have a knock sensor and one did????? i need to know? also does p28 have one or two o2 sensors?



    zach :blink:
     
  2. AllMotorMonster

    AllMotorMonster Senior Member

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    Only 1 p28 (auto or manual)

    And again, 1 o2 sensor...
     
  3. HardLowrdRanger

    HardLowrdRanger Member

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    If we're talking OBD1 there's a USDM P28 and Euro P28... The Euro P28 lacks PA sensor and injector test circuitry... Neither have a knock sensor board...
     
  4. word

    word Senior Member

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    actually there are 2 versions of the p28, p28a and p28b.

    p28a is from earlier obd1 models and p28b is from later. i don't know the differences but i've read p28a has even less restrictions than the p28b.
     
  5. pissedoffsol

    pissedoffsol RETIRED

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    i've never heard of a and b specifications. got any links to that?

    as far as i know, all p28s don't use a knock sensor, and utilize 1 o2 and come in manual or automatic varities
     
  6. word

    word Senior Member

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    i don't know the differences, i know they are very very minor to the point of non-existent. When I was at a junkyard to purchase my p28 I saw p28a's and p28b's so I know they do exist.
     
  7. blundar

    blundar Senior Member

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  8. AllMotorMonster

    AllMotorMonster Senior Member

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    Yea, please do tell...

    I've chipped 100's of P28 ecu's and there are no differences other than auto and manual.

    Even JDM P28's are virtually the same as USA models.
     
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