Pre/ warm up catalytic converters are usually found attached right below the exhaust manifold and before the flex pipe. These converters are made of a ceramic substrate for greater heat protection, while still allowing decent emissions control while the catalytic converter is warming up to the required temperature to start reacting with the VOCs such as carbon monoxide. These warm up converters are generally smaller in size and located under the heat shield that is over top the exhaust manifold.
I had that issue with my 2002 @ 45k it turned out to be the catalitic converter (if that's how you spell it)
how much does it cost to have a catalytic converter installed in a 2002 Mazda tribute
left exauhst pipe behind the Catalitic converter
When it comes to the o2 sensors you really should replace them both at the same time. The first measures the exhaust gases before the catalitic converter and the second measures the gases after the catalitic converter and sends this information the engine management system.
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The 2002 Mazda MPV has two flex pipes that comes from manifold. One of these flex pipes comes with the catalytic converter. I had it changed at Speedy and it cost around $800.00 cost, labour,taxes incl.
in the heads
Screwed into the cylinder head.
LOCATION OF OBD2 PORT?