Question about 2001 Jaguar S-Type

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Showing code cat? we changed all coils it runs great now!

Replaced all coirs the vehicle runs nice but now it is showing a cat code which i believe is the catilaytic converter what is this

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It's part of the exhaust and for emissions, looks like a muffler only smaller. Need to go to a muffler shop to have it replaced, or repair shop.

Posted on May 28, 2009


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1 Answer

ReNissan P0300

a misfire can be mechanical as well as electrical
code p 0300 is random/ multiple misfires detected
low fuel pressure is a probable cause from a problem fuel pressure regulator or problem EVAC system not venting properly causing a vacuum in the tank and starving the pump
erratic could be from valve problems on heating
loose valve seat insert/s, incorrect valve clearance from faulty hydraulic followers, cam shaft lobe failures are all part of the mechanical reason for random /multiple misfires

Oct 01, 2016 | Cars & Trucks

1 Answer

I recently reset the obdII error codes on my 2002 Kia Sedona after replacing the 3 ignition coils and plugs and wires to eliminate a problem with primary and secondary ignition coil circuit. Need to k

Replacing Spark Plugs & Ignition Coils
does not require any clearing of codes

You have 8 monitors on most vehicles

5 Monitors do not run all at one time

If the Catalyst fails when it does run, then you
may have not replaced the front O2 Sensors
at 100,000 or one failed
Have to use professional scan tool to look at data
& see if the I/M Monitors have run

The Evap is the last to run & there is no info avail
as to when it runs, as far as I know

The Evap will run once or twice a week-maybe

The cat should run by 50 miles of driving or a couple
hours run time

From 2002 until now-- I doubt the converter has much life left,
but the monitor will still run.

Look at scan tool misfire on Mode $06,O2 Data,Fuel Trim
and such, after a road test of 25 miles,then component test
anything not as it should be.

If you keep using your code reader to clear DATA- forget the codes,then your monitors,freeze frame & such are gone,thus your current situation.

Feb 28, 2014 | Cars & Trucks

1 Answer

2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.

having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,

Aug 10, 2012 | Kia Rio Cars & Trucks

1 Answer

Catalytic converter has plugged up twice in 3000 miles

Catalytic convertor fails due to oil burning, recent head gasket, improper fuel control,but plugging up at 3000 mile misfire surely plug it up when the vehicle is dumping gas in the catalytic, lean misfire ,running very rich due to a coolant temperature.Who is putting this on?I dont know what state you are from,a catalytic should not be installed unless the vehicle is in proper fuel control.and whoever installed this should foot the bill. You need to claim warranty regardless and plus there is a EO# that must match the vehicle.

Mar 17, 2012 | Cars & Trucks

1 Answer

1998 ford explorer 4 5 6 cyl. misfire

A code P0304 - 305 or 306 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 04, 2012 | 1998 Ford Explorer

1 Answer

Multiple misfire code, tune up, replace defective ignition coiland all three Cat's we're replaced. could oxygen sensor be the problem? if so how do I check the sensors I believe it has 4?

Tune-up--spark plugs---waste of time and money

Cats-- won't last long with a misfire-that is why they failed

O2 Sensors--should have been changed when the cats were,
as they were over heated or over 100,000 miles

You still have coil misfires,you even said so

You replaced a cop coil based on a code

It doesn't work that way

Feb 16, 2011 | 2006 Nissan Quest

3 Answers

Buick Century 97 runs rough and stutters when cold and gas applie

Your cat should last quite a while now it is replaced. I recommend testing coil packs and module. Change plugs and wires and double check your vacuum hoses.

Aug 14, 2009 | 1997 Buick Century

1 Answer

Navajo seems to be straining under load, and the engine sounds "out of whack" on an older car I would have thought the distributor cap was slightly off line... Could it be something like this? Feels...

Hi this sounds like the fuel filter, They start showing signs underload while driving, Also bad plug wires and plugs will show signs underload, and you have a coil pack on that one? I have change many coil packs due to one cyl being week , you can pull the plug wires off the coil pack one at a time while it is running check to see that they all have great spark make sure you dont have a week one. that should give you a starting place also you can check the temp of the inlet and outlet on the cat see if it is greater than 100 diff cats can cause this but it is what made the cat go bad which is usually a tune up issue that made it go bad.

Jul 19, 2009 | 1992 Mazda Navajo

1 Answer

No power

if it sounds like a leak before the cat try removing the cat and running the vehicle

Sep 27, 2008 | 1996 Ford Explorer

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