Hi have 05 lincoln LS has engine code P0354 but i change ignition coil cy4 to 5 but still same code what i have to do

codes are OBDll and are available on line free. Every scan tool comes with booklet with codes in it. If the person scanning does not have booklet do not waste your time.

A P0354 code means that the ignition coil or coils are not functioning properly and that there is an electrical problem with them. The ignition coils are responsible for properly igniting the air-fuel mixture in the engine's combustion chambers.

OBD-II Code P0455 is defined as a Evaporative System Malfunction, Gross Leak

No one can diagnose your car without having it.

https://www.yourmechanic.com/article/p0354-obd-ii-trouble-code-ignition-coil-d-primary-secondary-circuit-malfunction-by-valerie-johnston

https://www.obd-codes.com/p0455

https://repairpal.com/obd-ii-code-chart

https://www.obd-codes.com/trouble_codes/

codes are OBDll and are available online free
try googling your code.

A P0354 code means that the ignition coil or coils are not functioning properly and that there is an electrical problem with them. The ignition coils are responsible for properly igniting the air-fuel mixture in the engine's combustion chambers. If a vehicle has a P0354 code stored, it will not be able to ignite that mixture with the correct timing, and the engine will run roughly and/or stall.

The code does not automatically erase, you have to delete the error code.

code p0354 refers to ignition coil D primary /secondary--circuit malfunction===causes --wiring --ignition coil---ECM

replace the coil.

code p 0193 refers to fuel rail pressure (FRP) sensor---high input===causes ---wiring short to positive ---FRP sensor

code p0358 refers to ignition coil H -primary/ secondary--circuit malfunction ===causes --wiring--ignition coil---ECM

PO122--ETC Throttle Position (TP1) sensor Low Input

PO223--Throttle Position (TP2) High Input

PO354---Ignition Coil D --On an LS, that is not
a used code,another engine it would be cylinder #4

What I believe you have,having diagnostic experience
and also owning a 2004 LS,is a Bad COP Ignition Coil
on cylinder #4 that is bad enough to spike the PCM
& come back on the TPS Sensor

You ignore the codes and buy 1 new coil for $59.00
and put it in #4

If that doesn't help,remove the new coil and walk it to
another cylinder and drive a couple days,continuing
to move the new coil.

If you had some very expensive diagnostic equip
you could go with a different approach

The last thing you EVER want to do, is go to
a dealer,you may leave there the same as you were,
and a bill for a grand per visit.

IF you have a V6 and I hope you do not,
then if you get involved with cyl #1 thru 3 where
you have to remove the upper intake,do the spark
plugs on that side and all new coils while in there.
Save those coils for your future diagnostics

These coils fail at a rate of 1 or 2 a year on all fords

These codes are for a malfunctioning ignition coil/s.
P0351= ignition coil A primary/secondary circuit malfunction.
P0354= ignition coil D primary/secondary circuit malfunction.
visually check the coil packs for burn marks, damage, loose wire connectors, and the wire harness to each of the coils for damage. How long has this been happening? Has any work been done recently? Did the engine compartment recently get wet?

I have a lincoln ls 2002 and have had the same problems. It is corrected by changing the valve cover gaskets. The oil leaks down into the coils and fouls them out. You will not see the oil around the valve covers on the outside but this should fix the problem. It worked for me

try disconecting the battery for 5 mins see if it reeboots computer.

303-07A: Engine Ignition — 3.0L (4V) 2001 Lincoln LS Workshop Manual DESCRIPTION AND OPERATION Engine Ignition The electronic ignition (EI) system is a coil-on-plug (COP) ignition system.
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SECTION 303-07B: Engine Ignition — 3.9L 2001 Lincoln LS Workshop Manual
DESCRIPTION AND OPERATION Engine Ignition The electronic ignition (EI) system is a coil-on-plug (COP) ignition system
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SECTION 303-07B: Engine Ignition — 3.9L 2001 Lincoln LS Workshop Manual
REMOVAL AND INSTALLATION Ignition Coil Removal

1. Remove the air cleaner outlet tube. For additional information, refer to Section 303-12 .

1. Remove the bolts and the ignition coil cover.

1. Disconnect the electrical connector from each ignition coil.

1. Remove the ignition coils.
   1. Remove the bolts.
   1. Remove the ignition coils.

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SECTION 303-07A: Engine Ignition — 3.0L (4V) 2001 Lincoln LS Workshop Manual
REMOVAL AND INSTALLATION Ignition Coil Removal

1. Remove the engine appearance cover.

1. To access the RH bank ignition coils, remove the upper intake manifold. For additional information, refer to Section 303-01A .

1. Disconnect the electrical connector from the ignition coils.

1. Remove the bolts.

1. Remove the ignition coils.

please rate as fixed if this helps.