1995 Ford mustang question about Obd Codes?

Those two codes are upstream o2 sensor codes. Your car will not pass emissions with them on like that, especially in California. My suggestion would be to have the codes cleared, replace the o2 sensors and see if it comes back. If it does you will need to look more in-depth into the problem. If it works you will be ready to pass emissions and you should be all set.

Hope this helps, good luck!

Since it's a 1995 it still has the old OBD I diagnostics. OBDII didn't show up until 1996 so OBDII scanners likely will not work. Search around for OBD I scanners, keep in mind they not nearly as robust as the OBDII units and you'll have to be able to decode the error it comes up with. On some cars there is procedure that you can go through to get the check engine light to blink a code (RE: 2 short blinks, then a longer blink and then another 2 short blinks, the example I've give would be a 2-1-2 code.) You figure out the trouble code and look it up in a manual to tell what it means. Good luck,

Check with your Ford house to see if they have a code list for you. Otherwise, you can look up the codes in a Haymes manual (any parts house has them) for your particular car. A $20 investment will pay for itself many times over when you buy one for your car. It will show you step-by-step details on how to repair your car. It will also show you what to do with the codes. You can disconnect the battery for 10 seconds, and then reconnect it to clear any old codes. Then, drive the car for 30 minutes to reset any codes that might be current. If the check engine light is not on, your car should pass smog check. But in any case, call the Ford dealership, ask for the parts manager or better yet, the service manager, and ask him or her what those codes are. They fix the things, so they should be able to tell you about the codes.

Also, you should be able to find the code in your OBD reader manual. If you don't have an on-board diagnostics system reader, buy one. It's another worthy investment that will save you big bucks when diagnosing your car's problems.

Unfortunately I could of told you about every screw ,nut , or bolt; if only your car was 25 - 30 years older. With all this new tech. I have no idea really. The only way for you to get around the codes is by going to a work shop. It is designed so; so the car companies can earn more money. In the 70´s & 80´s & 90´s it was much easier to work on your own car. Sorry.

Any mechanic should know the difference between hard and soft codes. He could have cleared the codes and then rechecked. A soft code would not appear right away a hard code will. Those codes are both o2 sensor codes and are both pre cat, both banks. If they are not hard codes I would assume that something else caused them to set like perhaps you did a fuel injection service, I have seen those codes set over that.

i dont have a clue about california but inactive codes can be cleared by any reputable mech with a diagnostic comp. i know in ohio the stored inactive codes dont affect the test outcome good luck

P0135 is bad front oxygen sensor P0155 is bad rear oxygen sensor.If you take it to emissions like this it will fail,even though your light is not on.It's worth replacing the for that and,you'll save gas too.

Look the truth is the problem is Sensors Oxygen sensors your car is old so all Sensors like heat sensors need to be replaced.