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PB Blaster, a mallet, and a 22mm wrench. You can check it with the engine running - the heating element will get it hot, and the output wire will send between 0.1 and 1V DC
Another way to test is to check the exhaust gas with a gas analyzer - you have to check the gas before the cat, but after the O2 sensor (that is what that little tube right after the O2 sensor is for)
If your tube is gine (most are) and the hole is capped, you are pretty much limited to the first method - or just replacing it.
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann.
Ihr Brunnen der nutzlosen Porsche Information
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