So i’ve got a sierra that was a hand me down from my big brother who bought it off of some guy in our town. i’m just now learning how to do basic stuff with vehicles. everything has been going relatively good with it, it needs a rear axle seal replacement, new tire, oil change, and that’s about all i can tell. it’s giving me a check engine light how do i go about seeing what’s wrong? he told me that the engine was replaced entirely but he’s not sure about any details, how can i figure out what’s been put in it?

  • One-Most2748@alien.topBEnglish
    1·
    10 months ago

    Obd2 scanner scan codes then look them up, gives you a starting point. The picture of rear wheel looks to be a brake cylinder leaking not a rear axel seal. Take pictures as you take things apart !!! Good luck that is a nice truck. B

    • gnildiox@alien.topOPBEnglish
      1·
      10 months ago

      thank you! if the brake cylinder was leaking would my brake fluid go down? i haven’t noticed any changes in its level so I figured it’s just diff fluid

  • Advanced_Parsnip@alien.topBEnglish
    1·
    10 months ago

    94 should be OBD first generation, codes can be read by shorting pins 1 and 2 together, turning ignition on and counting the flashing CEL.