Why my lincoln ls is not reading the obd plug

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You have probably tried pushing the reset button on the dash and you do not have the OBD-ll scan tool or you would have erased it. Most mechanics offer free readings to try and get your business. Ask him to please erase your codes and go from there.

The bad coil is a staple of the LS. The best thing to do is to replace all 8 coils and plugs as the OBD is not particularly reliable for tracking down the misfire. If one is going and is bad enough to throw a code, the others likely are not far behind. One bad coil makes the others work harder.

The bad coil is a staple of the LS. The best thing to do is to replace all 8 coils and plugs as the OBD is not particularly reliable for tracking down the misfire. If one is going and is bad enough to throw a code, the others likely are not far behind. One bad coil makes the others work harder.

Read my other post to your other question

If the doors are open,drop the back right seat back,
& crawl into trunk & pull the yellow release tab

OBD2 Vehicles do not use the lighter for battery voltage,
that was obd 1 systems ,the power is in the diagnostic connecter
by your right knee,need adapter to use battery KAM memory
back -up

The seat may only be released from the trunk--.have to check my 2004 LS

First, if you would like help with your Lincoln, it would be really helpful if you were to mention WHICH ENGINE your Lincoln is equipped with. There were 2 different engines available for that year.

Second, if you are looking for spark plug wires on your 2005 Lincoln LS, you are in reverse...there are none. Your Lincoln is equipped with Coil-On-Plug (COP) ignition. Each spark plug has an individual coil mounted on top if it.

What, exactly are you trying to fix?

If you are trying to chase down an OBD-2 code P0304, there are a WHOLE LOT of possible causes for that code. However, on your vehicle, loose/missing/damaged spark plug wires is NOT one of them.

Please review the following article:

What Else Could Be Wrong?

Must read codes off of the obd-II computer using a scanner for obd-II so that you can know which system is being flagged. This is the first step.

May try to take it to autozone or advance auto parts to have them read the codes for free.

Or, you could purchase your own scanner at Sears or Walmart or your local parts store in order to read the codes yourself, and clear any that are intermittent.

If it's a hard code, as you describe, the scanner will come in handy.

Good luck on this diagnosis.

Any car built in 1996 for sale in the U.S. and later was required to be OBD II compliant. This meant that you need a scan tool with the ability to plug into the OBD II port. Some auto parts stores will do this for free, depends on where you live.

It should be under the dash on the driver side. It may be more towards the center though. I hope this help Please rate this thank you.

You can get an ACTRON scanner from Sears. The regular or plus version ($179). Harbor Freight sells scanners too.
But, you can go to AUtozone or most other stores and get the codes read for free when the CEL is on.
Get codes, report back before buying anything.
Sometimes codes are caused by other engine problems that influence the sensors and turn the light on.

The rough idle will usually be a misfire code.

I checked for TSBs. None found for 3.9L engine