Condensation is normal in the exhaust of automobiles. What may seem like leaking may be just condensation. However if the leaking does not stop after driving, you may need to have it looked at.
the seal is bad.
The simple reality is, it's either leaking or burning. If you can't find a leak, it's burning at a slow enough rate that the catalytic converter is burning it before it goes out the exhaust as smoke.Note, however, that condition will quickly change once the converter is fouled, then you get to purchase a new engine AND a catalytic converter.
Many of the compounds that make your engine oil work better on the INSIDE of the engine are also "poisonous" to your catalytic converter as your engine starts to use oil. The nice thing about catalytic converters, they burn unused hydrocarbons that come out the exhaust. You may not KNOW that your engine is burning oil until the catalytic converter gives out or even gets plugged up. Watch the oil level in the crankcase. If it drops with no evidence of leaking, it's burning and your catalytic converter will die.
where is it leaking from?
If it is leaking oil excessively you probably shouldn't. If the leaking oil was to reach the catalytic converter the oil could catch fire. Not to mention that everywhere you park you will leave a mess and you will be adding oil constantly to the engine.
Check to make sure the catalytic converter heat shield is in place or that the exhaust pipe has not been bent or is leaking.
Is it water ( condensation ) or is it antifreeze. If it is antifreeze it should be smoking WHITE out of the exhaust pipe and if it is then you have either a blown head gasket or a leaking Intake manifold gasket.
Are you referring to a loud exhaust sound? If so, it could be (Going from the engine back to the tailpipe) a cracked or leaking exhaust manifold - a leaking exhaust pipe - a leaking catalytic converter - a leaking muffler. That covers the exhaust system. If you are talking about a noisy clattering sound in the engine, you could possibly need a valve adjustment.
I have the same fault code on my 2003 Corolla. From my research, the code means that the car's computer is sensing that there has been a drop in catalytic converter efficiency. This is determined by the computer by comparing the signal of the O2 sensor mounted before the catalytic converter with the signal of the O2 sensor mounted after the catalytic converter. If the two signals are too similar, this means that the catalytic converter is not doing it's job. A number of things can be the cause of the fault code: # Bad catalytic converter - It's reached the end of its useful life. It's time to replace it. # Engine leaks oil and/or coolant into exhaust- Oil and/or coolant is leaking and is clogging the catalytic converter. Engine seals and gaskets should be checked. Engine compression should also be tested. Any leaks should be repaired and the catalytic converter should be replaced. # O2 sensor/s bad - Although O2 sensor failure usually gives it's own fault code, not everything is perfect. Sensor's should be checked anyway just in case the computer did not catch the fault. In this case sensor/s need replacing. I hope this information comes in handy. Unfortunately, what ever your specific situation is, it is most likely a costly one.
If you're getting an engine warning light on your Hyundai Accent, oil could be leaking into the exhaust valve. The could also be a problem with the catalytic converter.
Have you tried a new spark plug? Having same problem. It could be one of many things. Plugs, plug wires, distributor cap, rotor, or coil pack. It could also be but rarely, the EGR valve, or a plugged catalytic converter. If you smell rotten eggs in the exhaust, I would change the catalytic converter. Had the same problem it was because of an injector leaking into the manifold.
roof or heater core leaking roof or heater core leaking