Question about 2002 Jaguar S-Type

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I have a 2001 Jaguar S Type 3.0l that had a P0430 engine code and runs rough at idle when stopped and in gear. Replaced the fuel filter and catalytic converter on the passenger side but vehicle still runs rough and code came back. What other items could be causing this?

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PO430 = Catalyst System Efficiency Below Threshold (Bank 2) You may still have a sensor fault in the combustion/injection system, You need to get this checked at a garage with the correct monitoring system for while the engine is running. Or take a gamble and change sensors. Hope this helps - good luck.

Posted on Mar 09, 2010

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p0430 is the code for below normal catalytic converter efficiency. This may mean that the sensors are faulty in your exhaust stream or that the catalytic converter is clogged or otherwise damaged. That would may also be the reason for the rough idle. Clearing the code does not repair the problem. When codes are "cleared" it simply wipes your code memory clean until the onboard computer has a chance to re-establish the condition of your overall system. This cycle may take several days to weeks depending on how far and how often you drive. Usually there is a sequence of events that have to occur such as acceleration above a certain speed than a stop then a steady speed trip of several miles then another stop. Your engine has to reach normal operating temperatures as well. In short the code will continue to return until you track down the problem.

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I suggest replacing the O2 sensor(s). These detect the level of carbon monoxide in the exhaust, and at a certain level the exhaust is then returned to the engine to be reburned, then sent back through the exhaust, catalytic converter, then the muffler.

Take the code type to an auto parts dealer, and verify what the code is specifically referring to.

If the engine was idling (running) rough, also repalce the air filter, fuel filter, spark plugs<-- find out gap setting; plug wires, distributor cap and rotor (if equipped).

Also, if you haven't recently had the fluids changed, have them changed as well, as the filters for each and the gaskets if needed.

NOTE: if you smell an unusual smell coming from your car; the smell of rotten eggs or such, then your catalytic converter may need replaced.

Please let me know if you need further assistance.

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