Question about 2001 Dodge Durango

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Poor fuel economy.

I removed the cat on the advise of the guy at the exhayst shop. He said mine was clogged and removing it would "open'er up" at allow the engine to run more freely. My mpg dropped to under 10 and my truck is running very rich now. Do I need to put it make on or could an o2 sensor be bad?

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  • Dodge Master
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What you have done is alter the back pressure which will cause it to use more fuel contrary to popular belief a road vehicle engine is designed to work with a certain amout of back pressure and you taking the cat off has altered this ,so refit the cat and make sure the sensors are connected then test them with a multimeter ,what you do is with the sensor disconnected and their will be two of them one befroe the cat and one after but with the plug out check the two wires the same colour to the sensor for a continuety ,no continuety renew ,then the same two wires on the feed end of the plug check for 12v with the engine running if ok reconnect and across the other two wires you should read .08? something and engine is revved it should drop to 0.5? area if no reading then renew the sensor .To run a engine in certain countries is a offence now i know this is annoying when the middle east like bahrain and saudi do not specify new vehicles to have a cat is a whatever you want to call it but in europe and america you commiting an offence

Posted on Feb 15, 2012

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Posted on Jan 02, 2017

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Poor fuel economy, mileage


What should I do if my fuel economy is excessively low on my vehicle?

If your fuel economy is excessively low on your vehicle, it may need to be serviced or repaired. You may want to contact your local dealer or a reputable repair facility to check your vehicle. The following are some of the diagnostic checks a mechanic will typically conduct for poor mpg on your Honda Prelude:

Perform "On-Board Diagnostic System Check" for diagnostic trouble codes (sensors or actuators which may be malfunctioning)
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on Apr 17, 2010 | Honda Accord Cars & Trucks

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What does antipollution faulty mean? its just shown up on my dashboard. is it a serious problem


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Replace or remove the cat


So what is the question? It would appear that you have a catalytic converter issue going on. Replacement is the proper thing to do; removal is illegal in most jurisdictions. Besides, unless you want a constant Check Engine light lit, along with the possibility of very poor fuel economy, replacing the cat is the best option. Without it, the O2 sensors will not operate correctly and the PCM will default to a preset fuel usage that will decrease your fuel mileage by 20 to 35 percent.

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My truck was traveling at 70 mph, I gave it more fuel and it bucked and backfired hard enough to feel in cab. Just got new wires, plugs, cap and rotor. Once I let off it continued fine and even ran well...


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