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I know the answer to this. I just fixed my in laws 1999 626 with your exact problem. Power comes through the brake switch, and into what they call a "joint box". Basically this joint box is the back side of your fuse box where all the connectors go. Most likely you have a bad box, or connection at the box. It is the only other thing between your brake switch and rear brake lights.
NEED TO TAKE VECHICLE TO MUFFLER SHOP LET THEM FIX RUST PIPE WITH A NEW PIPE.LET MUFFLER SHOP FIX BECAUSE THEY CAN WELD JOINT SEAL BOTH NEW EXHAUST PIPE AND NEW MUFFLER SO YOU WONT GET CARBON MONOXIDE POISON LET MUFFLER SHOP CHECK ALL THE EXHAUST SYSTEM BECAUSE THE WHOLE SYSTEM COULD BE RUSTED DROP DOWN WHILE DRIVING YOU PROBABLY NEED NEW EXHAUST PIPE HANGERS.
the 4 cylinder has only one oxygen sensor. this sensor is a plug in with two wires coming out of it. As the exhaust leaves the motor the o2 sensor tells the car what carbon is leaving the. The o2 sensor is located on the exhaust pipe directly leaving the motor
If the noise sounds like your muffler, but isn't coming from the area of your muffler, then you have an exhaust leak upstream from the muffler.
From the front of your muffler, follow the tubing forward to the catalytic converter, then forward to the engine exhaust manifold.
If you start with the car sitting for a few hours to make sure it's cold, you can use your hand to feel for blowing leaks while the engine is running, but chances are you'll be able to hear it. be careful of the catalytic converter itself, as it heats up fast, so check that first.
Once you've found the leak, the fix depends on the emissions laws in your state. If you have none, and the leak is in the middle of the pipe, you can buy pipe patchers (metal preferred) through auto parts stores or catalogs/websites. If you have strict emissions laws, or the leak is at the junction of the catalytic converter and pipe, you'll need to replace the failing part.
It may be the catalytic converter or exhaust pipe heat shield(s), with the park brake set and ac on at ilde push on the sheet metal shields with a broom stick and see if the noise stops. It works best with someone in the car to listen for noise changes.
Most aftermarket exhaust systems are cat-back. You defiantly need to keep the cat to comply with local emsisions regualtions. However you can remove the mufflers and replace them with high flow mufflers or resonators. Try to replace them with something not too loud so you are in accordance with noise laws in your area. I have a 2000 s10 with no mufflers, just a cat then a y-pipe to make it dual with two resonators coming straight out the back, I live in the states and made sure this sytem was 50 state street legal before I purchased it. I suggest you do the same to avoid harrasment by the police.