I have been lurking on this forum for years, usually I find the solutions to my problems via the search. I own a 2002 RX300 with 161k miles on it. We just had the timing belt, water pump and associated pieces replaced. After picking up the car, and driving it home. No problems arose, upon restarting the car for the next drive. I noticed the VST, Trac off and check engine light came on and stayed on. Checking this forum, suggestions were to check for a possible unattached hose behind the air filter box. I did that and could not find anything amiss. I even went so far as to disconnect/reconnect the two electrical plugs that go into the air filter box. I also disconnected/reconnected the hose that goes into the air filter box. I disconnected the negative cable from the battery, while messing around the engine compartment. I put everything back in its correct place, and reconnected the negative cable. Upon start up and driving the car for 20 miles the warning lights did not come on. My questions after all this write up; is what hose has everyone been talking about that sits behind the air filter box to check? And does lifting the negative cable reset the codes?
