Question about 2003 Jaguar S-Type

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How do i fix code po420 & po430 on 2003 jaguar

How do i fix code po420& po430 on 2003 jaguar s-type

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  • Anonymous Mar 23, 2014

    dtc codes 330

  • Anonymous Mar 24, 2014

    What fix needed?



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Both these codes relate to Catalyst efficiency below threshold on banks 1+2. This is normally caused by a combustion fault. This fault may be shown due to a faulty sensor in either air imput or exhaust systems, Get the memory read at a dealers or good garage. If you had a serious problem the car would not drive well.
Hope this helps - good luck.

Posted on May 12, 2009


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02 Jaguar X Type code P0420 when it is below 50

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Aug 29, 2014 | Cars & Trucks

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Codes po420 and po 442 keep popping up on my 2005 Cadillac deville it has 90,000 miles what would be the most serious issue do you think all the most likely issue wrong with my car

Failed Ignition Coils

Resulting cylinder misfires over time
have ruined the exhaust converters (PO420 Bank #1)

PO442-small leak in Evap System

It's all on the internet ,if you Google your codes
& study OBD2 Systems

Type: OBD PO 442

On a 2005 vehicle-- All-- the ignition coils will be bad after
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At 100,000 miles the front Oxygen Sensors need to be replaced

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My car is chevy impala ls 3.82002 ,she have code 420,102,128

Use Google
Type----OBD PO420
Then OBD PO102 etc
Add your vehicle if you need more info
The 420 is a failed exhaust converter
Better find out why & fix that before replacing it

Jul 17, 2013 | Cars & Trucks

1 Answer

My 02 camry le failed emmission test whats wrong error codes po440, po441, po446, po420

You have codes for a failed exhaust converter,PO420,
EVAP System problem PO440,Incorrect Purge Flow PO441,
Evap Vent Control issues,PO446

Your car is all messed up

That should have been all checked, BEFORE you spent time
in line for inspection

If all the codes are for real & not a false report

You will need new spark plugs,ignition & fuel checked,
new exhaust converters,new evap purge valve,new evap
vent solenoid & possibly vacuum leaks resolved

You either bought someones neglected vehicle or never
do a thing but drive it

May be easier to get a different vehicle,your repair bill
will start at $1,000 & go up, from not being proactive & taking
care of what is required in owning any vehicle (lack of knowledge)

You will need the oxygen sensors also & no, they won't fix the
amount, of what appears to be several failed items, all at one time

So much for Toyota being better than other vehicles

Apr 03, 2013 | 2002 Toyota Camry

1 Answer

Check engine light is on

Go to google & type in ---OBD2 Codes
1998 honda accord PO420 etc

Mar 02, 2013 | Honda Accord Cars & Trucks

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Engine symbol came on my 2002 jaguar x type

A system malfunction

Now -- for the last 30 years we have had these OBD1
& OBD2 Systems

SO--- there should not be any wonder what's next

Check for Codes
Diagnose Code related System
Component Test to find failed sensor,wire faults,etc
Come up with a solution to fix or resolve code related
problem first & continue if there is more to work on

If you have an owners manual & everyone should,it may be
of some help,little, but need that for fuses & lamps anyway

Any Generic Codes you may get,the ones a code reader can see,
do not tell you what is wrong,nor to replace any parts at all

There may be codes stored for a year if the battery has never
been replaced.
Those you need professional software to see

Sep 12, 2012 | 2002 Jaguar X-Type

1 Answer

Po304 po307, i think my engine coils keep going out i also have a po420 code

You may have 1 bad coil not both #3 & & #7

You also have a bad exhaust converter from 10
years of on & off misfires

The PO420 is (Bank 1) Passenger side

Fix the misfires

Replace both Converters

Replace all 4 O2 Sensors

Converters should have lasted a few more years

A cop ignition coil is $59.00 & takes about 15 min to put in

No reason to pay someone $500.00

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1 Answer

96 jaguar xj6 code po420

The code P0420 is the catalytic converter, you need to get this checked, by an exhaust specialist or mechanic with the correct equipment/ testers ,if the cat gets badly blocked it can stifle the engine and gets VERY hot , so being a danger of fire. I have seen these glowing bright red.
Hope this helps

Oct 09, 2009 | Jaguar XJ6 Cars & Trucks

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