Question about 2003 BMW 7 Series

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BMW 2003 745LI brought from USA check engine light os on due catalitic convertor panc 2 problem how to solve this without changing the part it is expensive

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  • BRIAN HAMMONS May 11, 2010

    I would try to see if the catalitic con. is rely bad. Most of the time they will stop up but I don't think I have ever seen one actually go bad. A good exhaust shop can check the back pressure on the engine to see if it is stopped up or not.

  • Anonymous Mar 27, 2014

    just a check engine light

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I had a similar problem, had it diagnoses and found out it was actually the thermostat not allowing the engine to reach normal operating temperature thus signaling the Cat to throw an emission code. It sounds far fetched but the diagnosis and fix was correct. I had the thermostat changes, fuel injection service, new spark plugs installed all for $350 and I have never seen that "Check Engine Light" again. Plus, my car drives like new with improved gas mileage.

Posted on Jan 23, 2010

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Posted on Jan 02, 2017

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Thecheck engine light comes on. It was checked and they said it had three possable problems. I. A valve on the manifold. 2. A catalitic convertor. 3. A oxygen sensor. I believe they said that you have to...


hahaha, go to a different place and check that engine check light again. go to autozone, advance auto or something. have them plug in the code scanner and it should give you exactly what needs to be change.

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Take the car to the dealer. Or better yet tow it there before you catch it on fire something is wrong with the engine or emission control system. This problem is causing raw gasoline exhaust to pass into the catalitic convertor where it is burning causing the cat to glow orange. This is very dangerous it can cause a fire.

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P0430 is a catalist efficiency code and if the vehicle lacks power it is possible that the cat could be plugged or melted inside. Catalitic convertor would need to be replaced if the case

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Catalytic converters


If you are going to change the convertors I would just replace the first one closest to the engine. But when a computer code says "bank" they usually are refuring to the Oxygen sensor that is there , they are classified as bank 1 and bank 2. 1 being closest to the engine and 2 being farther down the exhaust. If its a computer code that told you bank 1 you might need to look at your oxygen sensor instead of your catalitic converter.

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