02 Sensor
 

91 2.3 F.M. 4 cyl
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Anyone got any suggestions on how to test/change and 02 sensor that has been in my car a long........ time.
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I need to buy an electronic engine analyser, does anyone know where to get one?
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And a cracked stock exhaust manifold (2-3 cm), I am thinking about replacing this with a exhaust header and have heard and seen many. Which on would work with the stock muffler system?
And which one would allow me to re-connect all the stock sensors into it without any modifications.

seen:
97' and up ranger exhaust.
19" shorty headers
pacesetter header

Thanks for your tips/help on this matter
lever_John@hotmail.com
91 Ford Mustang 2.3 L 4 Cylinder