Originally Posted by skabone69
typically if an engine light goes off its due to the oxygen sensor, so your car should be fine to take out on a beater run. heck the ligh might go out after you beat on the car. I have had a check engine light on for just about a year, its for my secondary O2 sensor and the car runs great. Just last week I got 420 miles on one tank of gas. I'd be sketched out to spend that kind of money to for the ERG valve and intake manifold. you should be able to replace the erg valve yourself. got to a local auto parts store to get the part, and you could run a search on how to install the erg valve. it shouldn't be that tough, and it might save you a ton of cash.
Check engine lights go off anytime you have an open/short on an OBD1 car.
The only reason your car runs "great" is because the secondary O2 sensor isn't used for fuel control. This guy doesn't have a secondary o2 anyways and even if he did that won't cause a Nox problem generally speaking. Nox is formed when the combustion temp. exceeds 2500 f. You need to look at the egr system first. These CB7 models of accord get clogged EGR ports all the time. You can clean them without replacing the manifold. You need to go to a Honda specific shop and stop listening to ppl on HAN who think they know everything. Chances are the manifold is clogged.