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https://www.outilsobdfacile.com > Dodge
The norm states that the port must be located inside the vehicle passenger compartment. Depending on the make and model, it may or may not be easy to locate. ...
It is probable the catalytic converter is no longer doing the job it is supposed to be doing but it is equally probable this has a deeper cause such as physical damage to the exhaust, too much unburned fuel entering the exhaust for too long due to a misfire, excessive engine oil consumption.
Considering the age of the vehicle it would be sensible to begin by ensuring the fuel pressures are ok and the injector spray patterns are good - bad spray patterns can introduce fuel into the cylinders that don't burn very well...
is the check engine light blinking? if so have it tested for codes, Kragen auto and others do this test for free, just ask for a OBD2 fault code test. let me know the results and we can work from there.
actually there are 4 sensors. one on each exhaust manifold and then as you said one prior and aft the catalytic convertor. this is saying it is reading too rich a reading. check the condition of your spark plugs. you need to pin point the reason. chances are it is not the o2 sensor. happy holidays
That is a code for the secondary (spark) circuit on cylinder number 3. It is usually caused by a bad connection between the coil and the plug (take the coil off the plug and check for moisture in the boot). If not, it might be a bad coil...
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