Question about 2002 Suzuki XL-7

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What would make a Catalytic Converter to melt down? There are cats on the manifolds and they are fine, but the downstream, the one that melted was new,changed just for maintance,.The car passed emission and no signs of over fueling

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Excessive high speeds for long periods of time,wrong fuel inj. cleaner,too much fuel cleaner or octane boost,er.

Posted on Oct 03, 2009


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1 Answer

Location of a 02 sensor on a 2.4l Saturn vue what does it mean a upstream or down stream

upstream is before the catalytic converter - most time on the exhaust manifold
downstream is usually in the cat or after

Oct 22, 2017 | Saturn Cars & Trucks

1 Answer

Missing then no power . Stopped exhaust glowing red .now want start but turns over

Your catalytic converter is bad ! misfiring cylinders sends raw fuel down exhaust to catalytic converter were it burns an melts the insides causing it to plug . Suggest you take your vehicle to repair shop ! A new Catalytic converter can cost up to $700.00 or more . Some states , New York , California have to have Carb. certified cats .

Apr 04, 2016 | Cars & Trucks

2 Answers

How many 02 sensors does a 2001 Cadillac deville have

4 total. 1 each manifold. Then 1 before, 1 after the CAT. You should be able to count and trace them from the connections on the top of your engine. Good luck

Feb 23, 2015 | Cadillac DeVille Cars & Trucks

1 Answer

OBD-11 PO430

P0430 is a bank two catalyst efficiency. On this vehicle bank two is the manifold that is in the front of the car by the radiator. The catalytic converter in the manifold is most likely bad. You will need an exhaust manifold to repair the issue. If the problem got bad enough that CAT would have melted out and clogged your Main CAT. If that was the case the vehicle would have little or no power under acceleration.

Mar 29, 2014 | 2002 Ford Escape

2 Answers

Engine turns over but won't start

Catalytic converter in the exhaust system might be plugged solid.

Dec 28, 2013 | 2010 Jeep Liberty

1 Answer

Catalytic converters get red hot

If you have a skip,,then thats what killing the cats..If the new one turn red on ya,,you probably already melted the inside..Need to fix the skip before you go any further..They wont warranty the cat if it melted on the inside

May 08, 2012 | 2001 Ford Taurus

1 Answer

P0420 engine code

P0420 is a catalytic converter inefficiency code. The most likely problem is the catalytic converter is no longer able to function. The cat is monitored by the downstream O2 sensor. Unless there was a leak near that sensor than its unlikely (but not impossible) that an exhaust manifold leak is causing the problem.

What is possible is that the leaking exhaust manifold is skewing the readings for the upstream O2 sensors which could effect the life of the cat if the vehicle is running slightly richer than it should be.

I’m happy to assist further over the phone at

Feb 24, 2012 | 2003 Hyundai Santa Fe

1 Answer

02 mercury sable egr pressure feedback sensor keeps melting on the smaller vacuum side. And keeps blowing out smaller hose. Engine is running ok at idle but will not accelerate past 20 mph. What would...

Most likely it is the catalytic converter one the firewall side clogged. the part that melts is the exhaust feedback side and it backs up the hot air once the converter is clogged. I had same problem on 03 escape. Also resist putting straight pipe on downstream converter because it catches any loose carbon from going into the muffler. If the muffler is clogged it will do the same.

Aug 12, 2011 | Mercury Sable Cars & Trucks

1 Answer

I would like to know where the oxigen sensors are located and how many does my 2003 lincoln navigator has?

the oxygen sensors are located in the exhaust pipe. There will be at least three and possible four. The upstream sensors are always located before the catalytic converter and usually close to where the exhaust pipe bolts to the exhaust manifold. The job of these two sensors is to monitor the difference in oxygen values between the outside air and the exhaust to help determine proper air fuel ratios.

If you have a single catalytic converter than there will be one O2 sensor (downstream) located after the catalytic converter. If there are two cats than there could be two O2 sensors behind each cat. The job of these two sensors is to monitor the catalytic converters efficiency.

I’m happy to assist further over the phone at

Oct 25, 2010 | 2003 Lincoln Navigator

3 Answers

Location of upstream and down stream oxygen sensors on 3.8 buick lesabre

They are usually on your exhaust pipe before and after the catalitic converter.

Nov 07, 2009 | 2000 Buick LeSabre

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