Check engine light is on. Just got my Prius back together yesterday after water pump/thermostat/pcv/egr/cooler/manifold service. Was very careful to torque it all, went over each connection several times. I didn't put the cowling back on yet, will do so in the morning. I did connect the wiper motor to avoid an error code. Ran for a bit in mainentance mode, refilled with about a gallon and a half of antifreeze fluid. Tomorrow will get the car completely ready to drive. It sat for a few weeks but started up easily and battery is mostly charged. ODB scanner says "MANFOLD ABSOLUTE PRESSURE / BAROMETRIC PRESSURE CIRCUIT HIGH. Dr. Prius cannot seem to connect to this scanner. Any ideas, I'd be happy to listen. My plan is to get it out for a drive and see if the symptoms resolve.
A bit more background here. I did buy a new exhaust manifold off ebay. It was reviewed well by others but it is a cheap version. Forgot what I paid. I will clean the old manifold tomorrow and see if that fixes it. Also got a new EGR valve online from a Toyota dealer on a close out. A bit over $100 dollars. I can clean the old one as well. Wasn't getting this code before. Will also check MAP sensor to see if anything obvious is wrong. I suppose the first thing to do is just clean the MAP sensor and hope the code goes away . Edit: I did order a new MAP sensor. It was cheap enough. My suspicion is the manifold. Second time around should be a lot quicker. Of course, the map sensor bolt did break off in the manifold, so there's that . My biggest concern of "too much pressure" is blowing a head gasket.
Got down to the map sensor and went to remove it, but noticed it slid out easily. Apparently, I didn't connect it properly. Clicked it, disconnected the battery/waited 10 minutes, and no code on the start. Now to put the cowling back on and take this sucker for a test drive . No error codes, no triangle of death. Thanks to Merv and NutsAboutBolts and all the guys on PriusChat! Now I do know it is sacrilege, but I did put in a 1/2 dose of the low dose Kseal, which was 2 oz total. Hoping to seal any very tiny issues that could be staring with my head gasket. 205k, hoping to get to 300k before I replace the head gasket or the motor. Had I not run into so many broken bolts, this would have been a 2 or 3 day job for me. I'm not a pro, I haven't got the greatest tools. All in all, a great learning experience. Just hoping that's the end of it and I can drive for a few months without issues. My advice to others is if you don't have an extra car and can afford to be down for a while, pay a shop to do this.
