After 10 min of driving my 89 CSX is throwing code 51. The code list I have in the car says this a issue with the baro reading. But I just searched TM.com and I found a bunch of posts about bad O2 sensors. Which is it, and how do I fix it? I've never had this code before. The baro is hooked up and the vacuum lines were redone a few years back. The car has been in storage for the past 4 years. The code seems to just pop up on the freeway, but I haven't drove it on back roads to much. Remember the 89 CSX uses a SBEC.
Thanks.