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2002 lincoln ls 3.0 is pulling up the po420 code and i have replaced the coil packs and the check engine light is still on but no longer is over heating. Can someone narrow this down for me please

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  • Lincoln Master
  • 1,127 Answers

Replace the catalytic converter,it is defective and allowing exhaust gases to pass through it untreated.Run the oxygen sensor readings and you should see the rear sensor readings close to the front sensor readings which has then set the p0420.

Posted on Apr 18, 2019

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: coil replacement How?

I guess as you may know , it has indidvidual coil packs for each cylinder. The ones on the driverside, 4,5, and 6 are easy to change. just unscrew the bolt holding the coil pack down on the plug and pull it off and unplug the coil pack from the locking plug by squeezing near the back where the wire goes in the plug. The ones on the passenger side require removing the intake manifold to get to them. This is not as hard as it may seem but the wires and a bracket connected in the back of the manifold do need to be disconnected in order to free the manifold for access to the coil packs. Wasnt such a hard job but a bit of a challenge.

Posted on Jan 25, 2009

  • 82 Answers

SOURCE: 2002 Lincoln LS V8, gear shift shows E, check transmission light

sounds like tranny computer is bad take it to a grage and have a computer put on it cost about $50.00 to do this

Posted on Feb 23, 2009

c17hydro
  • 2989 Answers

SOURCE: 1997 toyota camry check engine light on,code po440,po420,po441,

P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Posted on Mar 29, 2009

  • 155 Answers

SOURCE: 2004 Lincoln navigator misfire on cylinder 8 error code p318

Replace the coil pack once more. I went through 2 new ones on my f150 on one cylinder. One worked, the other didn't (both new off the shelf). Condensation build up in the boot caused mine to misfire. Anytime you replace a coil pack, squirt a little silicone grease inside. This will prevent condensation from hitting your plug. Fords are notorius for this problem, especially if you live in a humid area. Also, make sure and clear the codes after you make the repair.

Posted on Jun 10, 2009

SOURCE: where is the coil pack located on lincoln ls v8 7

Driver side valve cover
7mm socket to remove coil covers and coil

1 thru 4 pass side
5 thru 8 drivers side
Front to back

Posted on Jul 31, 2010

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1 Answer

In a 3.9 in a 2002 Lincoln LS is there more than one cylinder head temp sensor? Are they located between the coil packs?


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I have a 2002 Lincoln LS that up to 3000 rpm seems to run fine. at 3000, it starts to shudder and miss. any ideas/


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2005 lincoln ls ruff cold start then smooths out


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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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Check this diagram for details 2002 Lincoln LS 3.9 liter DOHC V-8 VIN "A"

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Hope this helps.

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My 2005 lincoln Ls check engine light and wrench light comes on. the first time - a ford tech. changed a spark plug& wire. the second time a different spark plug & wire. third time another spark...


I have the same problem. My Lincoln Ls wrench light comes on and it quits. All spark plugs, all coils and the throttle body has been replaced. I think the LS model is a lemon! Any information or suggestions will be appreciated.
Thanks, Betty

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My 2001 lincoln ls is sputtering at 40-50 mph,engine light comes on for couple hours


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2003 Lincoln LS check engine light


I had the same problem with a 2004 LS. I took it to the dealer and turned out that 6 ignition coils were out and was factory defect. Ford extended the warranty for the ignition coil. All work and parts "no charge" this service was done about a month ago

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Location: Coolant Temp Sensor 2001 Lincoln LS V6


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