Question about 2002 Jaguar S-Type

1 Answer

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?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Jaguar Expert
  • 322 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2001 X type 2.5 in Limp Mode and check engine light on. Scan codes P0300-302-304-306, P0 314-316and P0352-356 and P0430

The P0430 is a catalytic convert Efficiency Below Threshold Bank 2 .You have multiple misfire codes , You melted the catalytic converter . You need to take it to a ASE certified repair shop .

Dec 16, 2015 | Cars & Trucks

3 Answers

2004 Explorer - just suddenly started Chugging like it is staving for gas and will not accelerate?

If Service/Check Light On Have Computer Scanned For Codes
Have Exhaust System Checked For Obstruction
Have Fuel Delivery System Function Checked--Don't Forget Fuel Filter.

Apr 02, 2015 | 2004 Ford Explorer

1 Answer

Engine running rich

Sounds like a dead coil pack and needs replaced cause you're getting no fire to those plugs and causing a rough idle. Another thing is, that catalytic converter will only turn red because it's plugged up and needs replaced. Have that checked out friend.

Jul 10, 2017 | Cars & Trucks

2 Answers

Po430 code

P0430 means you have trouble to emission. most likely at catalytic and 02 sensor, replacing plugs might help if it is not been replace for a while about 70k miles this might help your idling. if you have access to scanner check fuel short trim a higher trim indicate fault at upstream 02 sensors.

Nov 06, 2013 | Cars & Trucks

1 Answer

Cold start rough idle

If you replaced the plugs, did you replace the intake manifold gaskets if not, then replace them. They must be replaced every time the manifold is removed.

Nov 03, 2017 | 2007 Jaguar X-Type 2.0

1 Answer

I am getting a PO430 code on a 2005 Chevy Express. It starts and runs fine until I stop the engine for a few minutes then when I restart it begins to sputter, idle rough and no power. If I let it idle for...

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.

Sep 21, 2010 | 2005 Chevrolet Express

1 Answer

I have a 2001 jaguar s-type and idles rough intermitadly and will stall


Jul 15, 2010 | 2003 Jaguar S-Type

1 Answer

I had my check engine light come on & the code is a P1259 /fuel and air metering issue. Does anyone know what part this code is referring to that may need replaced? The car is running okay. However...

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.


Guru, Premium Expert @

Jun 14, 2010 | 2001 Honda Civic

2 Answers

"Restricted Performance" message and rough idling

My mechanic said that the front cxygen sensors needed to be replaced on my 03.

Aug 23, 2008 | 2003 Jaguar S-Type

Not finding what you are looking for?
2002 Jaguar S-Type Logo

939 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jaguar Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22393 Answers


Level 3 Expert

83624 Answers

gerry bissi

Level 3 Expert

4387 Answers

Are you a Jaguar Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides