So I picked up a used 1997 Q45 for $700. It has 189k on it and the body is in awesome shape, a bit of hail damage, but I can't complain lol. There's a few minor quirks, but the main issue I'm looking at is the TCS, ABS, and brake lights on. I did run a scan on the codes and got a few codes: p0110 p0325 p0330 p1110 p1135 p1210 p1400. I read something about replacing the brake relay, I just don't want to replace the relay and find out it could be something else. Any ideas?

Just go to autocodes.com

Looks like you have lots of expensive issues. Good Luck

to NICO!

You can do a lot of research on those codes in your factory service manual, available at www.infinitiservicemanual.com

Consider downloading the whole .pdf for your personal use - the manual could be a "here today, gone tomorrow" proposition, but for now they're up.

I think I recognize some of them being misfires due to (plug wires/valve cover gasket etc) and then something with the emissions like charcoal canister, Evap purge. The service manual here did help me out figure some of them out