Check engine light on solid
 

2004 S2000, Mileage 135,000. Had AutoZone pull the codes: P0172, P1457. Read definition on this site. Fuel System too rich, EVAP Control system leakage. Then this comment from AutoZone: ASE Certified Master Technicians have seen this issue on your type of vehicle and the most likely solution is: Replace Timing Chain and Tensioner. FYI - this has not been done anytime in the past.

Comments?

Replace timing chain.. Wow that's a good one :rolleyes:
My first guess would be the purge solenoid valve is stuck open but there could be other things as well.
Try to find and download the work shop manual, there are links on this forum that should not be to hard to find.
Then search for P1457 and follow the troubleshooting guide there, P0172 is most probably just a secondary fault because of the P1457.

That is the worst advice I've ever seen.

If your car is running super rich then you either have a vacuum leak, your O2 sensor is about to bite the big one, or you have leaking injectors, or absolute worst case scenario you have a bad ECU. Is power ok? Does it idle fine? Do you see a lot of soot on your bumper? The more details you give us, the easier it is for us to form an accurate picture of your situation and give better guidance.

Hope you weren't referring to my advice :)
Here you can get the manual I was talking about http://s2000.club
The 2000-2008 version is the best.

A vacuum leak causes a car to run lean, not rich. If large enough though, the system can go full rich on the mixture to try to compensate which may set the rich condition. Would defintely try to isolate vacuum related issues setting the EVAP code and go from there.

AutoZone's LOL.

Vacuum leak causes car to run lean and then the O2 sensor picks it up and floods the engine with fuel to compensate. Won't happen while the car is warming up though, because the ECU only relies on the O2 when it goes closed loop.

It is impossible for a chain, tensioner, or both to fix your problem. That is beyond an incompetent answer, not even a good educated guess.

P1457 is likely due to one of the 3 evap control valves sticking.

"ASE Certified Master Technicians."

Not like they just throwing any old title around. :argh:

Autozone is really kinda like the Kmart of autoparts stores, and I dont even expect reliable repair advice from a good autoparts store :P