What causes the honda accord tcs light check engine light to come on?

Whenever You see the TCS light illuminate in Your Honda Accord, You can typically assume that there's an issue with Your wheels or other part of Your traction control system. Commonly, You'll see a wheel speed sensor go bad or have erratic performance; in any case with a dash light, You should get access to an OBD-II scan tool to diagnose. This is a service offered for free at many automotive part stores. A big issue with Accords specifically is a clog of the EGR port, which will cause the symptoms that You're discussing. Many drivers report replacing the EGR valve, which typically isn't necessary; You'll just need to gain access to the port and give it a thorough cleaning, along with the intake manifold. Honda actually put out a technical service bulletin on this widespread issue.