1999 Civic Si CEL code questions?
 

Okay, I did do a search, and found the codes but not really the meanings. Advance Auto read the codes, cleared them but they came back within a day. I have the B16 Civic Si, 1999. Only has a header, cat back exhaust, short ram intake. The first code, P1457-Unable to pull vacuum in tank. Would this pertain to the gas cap? I have tightened it many times and am considering a new one. The 2nd code is a P0133-O2 slow response, bank 1, sensor 1. Pretty self explanitory, but what is "bank 1" and "sensor 1"? Is this the sensor before the cat? I think it is 4 wire. Is the slow response meaning it is about to fail completely, because my gas mileage is suffering pretty bad. Just had the engine rebuilt because rings were bad so maybe the O2 is fouled up? Any help would be great, as lack of funds leaves a visit to the shop out of the question. Baby formula and diapers are priority, sleep is only a limited luxury. http://is.rely.net/1-92-65076-l-NREc...mLFY3DaZnA.gif

Re: 1999 Civic Si CEL code questions? (85ZC)
 

On the gas tank code: I used to get this code consistently all the time. After changing the evap purge valve, gas cap, and all the hoses in the evap system, I was still getting the code. I mean, it was on constantly for about 2 years.

Try this: When you fill up the tank, try running up the last $2 or so on the lowest setting of the pump, so that it doesn't overfill when it clicks off. When I started doing that, this code went away and I haven't seen it again.

Re: 1999 Civic Si CEL code questions? (85ZC)
 

For P1457, first check the rubber seal on the gas cap. If it can't make a tight seal, then you have likely found the problem.

The other code is for the primary O2 sensor, which is located before the cat. (The secondary O2 sensor is located after the cat.) Replacing the primary O2 sensor will likely fix the problem, although the sensor is expensive.

Cool thanks alot! Will try those suggestions.