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I've got an 87 Comanche with a 4.0L swap from a 99 Cherokee. The check engine light has been on since I got it, and the seller's mechanic told me they'd never really looked into it because emissions standards weren't as strict in Texas or Utah. However, now that I have it in Cali, I need to get the light off before I can get it registered. When I first pulled codes, I was getting two: P0132 and P0135. So I replaced the O2 sensor before the cat and the corresponding fuses. Unfortunately, the check engine light is still coming on. OBDII says 0 codes but is showing multiple MIL warnings and I was hoping some people on here could offer some guidance. The following are from the reader, along with my interpretations given the readers manual: 0 Codes MIL On Monitrs 2 Inc Catlyst O2 Htr 4 Ready Misfire Fuel Comp O2 Snsr Based on my reading of the manual, this means that 2 monitors were incomplete, the Catalyst Monitor and O2 Heater Monitor and 4 were completed and shown wanting, the Misfire Monitor, Fuel Monitor, Comprehensive Components Monitor and O2 Sensor Monitor. I should also mention that the vacuum canister that's normally in the front left of the engine bay is missing (I can take a picture if needed), and this is what the mechanic whom I picked it up from thought was causing the issues. If this is something that will require too much time or expertise to sort out on my own, I will probably end up taking it by the shop later this week. But if this is something I could use as a learning experience, I would love to take care of it myself. To be honest, I don't even know where to start in diagnosing and fixing these monitor warnings, so any help and guidance would be GREATLY appreciated. Thanks!