Question about 1995 Ford Mustang

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Are cat convertors required on a car to make it run and is it even leagal to take them off Ive seen sevral people do it

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The catalytic converters are mandated by Federal law. Unless the clog (due to driving for many months with an engine miss or other cause of engine running to rich), they do not hurt the performance of the car. Federal law mandates that the manufacturer warranty the catalytic converters for 8 years or 80,000 miles. They take unburned residual fuel and burn it completely. This helps improve our air quality. The easiest way to detect a defective converter is to bang on it with your fist (when it's cold). If a rattling sound comes from the inside, it means that the unit was overheated, due to an excessively rich fuel mixture. The unit must be replaced, because the loose ceramic media inside will soon clog the exhaust, causing poor performance. I know of many who remove them. If your State has an inspection law, you will be forced to re-install them. Removing them on 1996 and newer cars will cause the CHECK ENGINE lamp to illuminate. Charlie

Posted on Jun 14, 2009


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I have 96 buick code p0420.I have replaced the converter and both 02 came back on code p0420. do not know what to do next, help.

fault code that is set when the Onboard Diagnostic II (OBD II) system sees a drop in converter efficiency. The OBD II system monitors catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in the exhaust manifold reflects the condition of the exhaust gases as they exit the engine. The downstream O2 sensor in or behind the catalytic converter reflects the condition of the exhaust after it passes through he converter.

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He cat.convertor is getting red hot and the spark plugs r black.....but bet of my knowage no codes found t

There has to be codes. Well you melted another converter. Your injectors are leaking and the raw gas is overheating and melting your converter Your plugs are black that means way over rich and no codes? If you take the cat loose it puts a code in immediately

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02 sensors

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The cat converter was trying to burn all of the excess fuel that was being sent out of the exhaust due to the misfire, got way to hot and melted the inside of the cat. I experimented with this while in tech school. You can burn up a cat in about 15 minutes at around 3000 rpm with a single cylinder misfire. I also work at a shop that specializes in miatas, and have seen this before. Get a new catalytic converter.

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You have a V6 engine, bank one is the row of cylinders on the passenger (right) side, bank two is the row of cylinders on the drivers side (left). Your codes indicate an inefficiency in the cat on the left side but this could be due to a bad O2 sensor or an engine that is out of tune and overloading the cat. This car seems too new to have a bad cat. I would change the plugs and the O2 sensor after the cat before going any further. The reason I say the O2 after the cat, it's the one that is critical in sensing cat efficiency. What is the mileage?

Mar 26, 2009 | 2005 Mitsubishi Galant

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