Volvo RWD 700 Forum

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test hole? 700

Yeah, them. I always understood the purpose to be the test port for the emmissions inspector to insert the test probe.

Could be the location of an O2 sensor, though. I don't have the need, so, I don't know. Most O2 sensors I know about are located on the exhaust manifold.

But if you're in California, well.....

Point is, Bosal is a good brand, and make sure you put sealant on the threads of the plug so it won't vibrate out.






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New guess who needs a new cat? me! :-( brand recommendations? [700]
posted by  invar  on Thu Jun 6 10:46 CST 2002 >


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