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The code specifically means P1457 Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System). These can be very tricky to find. First thing and cheapest thing to do is replace the gas cap and then see if the check engine light goes out after your drive it enough or have the light reset. If that does not work then you need to take it to a shop and have a smoke test run.
The GReddy Ti-C Catback Exhaust System will have absolutely no effect on emissions readings because it retains the stock catalytic converter.
EVAP Emission Control System Leak Detected (Control Canister System)
The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, a check engine light is lit when there is a problem in the emissions or somthing that is affecting the effectiveness of the emissions.
csf sensor no signal
Trouble code P0730 means: TCM A/T Shift Control System
Locate heater control valve in a 2001 Honda civic
For a 2001 Honda Civic, the P0730 code means there is an issue with the shift control system. Dirty transmission fluid is one of the many things that can cause this code.
Go to Hondahookup.com (You'll have to register) Download the manual for a 92-95 Honda Civic because the manual for 91 CRX doesn't show the EGR valve. After download go to the section that says "fuel and emissions"--The Egr section is on pages 11-135 thru 11-139. One difference between the Civic and CRX is that the 2P connector is 2 wires on the civic and 4 on the CRX. The extra 2 wires on that plugin go the fuel injection system componet which is also unfer the control box. The 2 wires(on the 4 wire plugin) that go to the EGR control solenoid vale are ORN/BLU and BLK/YEL-----Hope this helps
Trouble code P1456 means: EVAP Emission Control System Leak Detected (Fuel Tank System)
Trouble code P0730 means: TCM A/T Shift Control System
Malfunctioning emissions system. Get this repaired. Engine probably running rich from a leaking fuel pressure regulator. If there is fuel in the vacuum line the regulator is bad.