My 2005 S type has run like a dream since I bought it a year ago. It is a V6 3.0 with 175,000 miles. All of a sudden the other day as I was getting on the interstate it started losing horsepower & eventually shut off but would crank back up & run for just a minute It is running rough. Had someone change spark plugs & was told I had oil in back 2 spark plugs. Put an Autel Auto Link Pro Scan Tool on it which produced codes P0306 Cylinder 6 misfire, P1314 misfire rate catalyst damage fault bank 2, P1316 injector circuit/IDM codes detected, P2097 Post catalyst fuel trim system too rich bank 1, P0158 O2 sensor circuit high voltage bank 2 sensor 2, P1646 Auxiliary inputs/outputs and P1000 refer to service manual. Any suggestions/advice on where to start? Any help is appreciated in advance. Not sure if this is related or not but my air conditioning stopped blowing cool air right before this happened and the screen for the radio and climate controls goes in and out. Sometimes it works. Sometimes it doesn’t

 

Some of those are wrong - use Jaguar's data instead. JagRepair.com - Jaguar Repair Information Resource

Then, use Search to see what to check/fix.

 

This is a common issue and not a huge deal. The long-term fix is to replace the valve cover gaskets to keep oil from seeping into the spark plug wells. If you're lucky, the coils will be fine with a good cleaning with aerosol electronics spray. Don't use brake cleaner, as it can be tough on plastic. At worst, you'll need to replace any suspect coils.

If in a pinch for time or money, you can usually clean out the spark plug wells until you can replace the gaskets. Unless the oil leak is a gusher, a good cleaning will buy you a little time until you can do the proper repair.

If you do replace any coils, make sure to get a quality name brand such as Denso or NGK. Stay away from no-name Chinese specials on eBay or the house brand at discount chains.


Yes. Jaguar's official codes are here. The generic codes from most scanners don't always match what Jaguar says:

http://www.jagrepair.com/images/Auto..._OBD_II_R2.pdf

See page 3 for cylinder numbering. Concentrate on P0306 first. I'd call that a primary code. The others are more of what I'd call secondary codes, triggered in response to the first one.

Be aware you might get P0306 cleaned up and other faults suddenly appear. If you have low power from multiple cylinders, sometimes the computer can only flag the worst offender. I may as well get up on my Misfire Soapbox™. For dramatic effect, other forum members will hum the Battle Hymn of the Republic.

If the computer has set a misfire code, please be aware "misfire" wasn't the best terminology that could have been used. Misfire sounds like an ignition problem, at least to me, meaning the fuel and compression were there, but for whatever reason, the required spark was missing or weak. This might lead an aspiring mechanic to troubleshoot the daylights out of a perfectly good ignition system. I do not care to discuss how I know this.

In OBD-speak, misfire simply means one or more cylinders is putting out low power compared to the others. Pretty much anything affecting the output of a cylinder can set a misfire code. It can be low compression. It can be a valve not opening fully. It could be a clogged fuel injector. And yes, it could be an ignition problem, too, but don't overlook the other possibilities, too.

Okay guys, you can stop humming. Thanks.


Hmm, that's curious. First thing I'd suggest is checking the output of the charging system. I wonder if system voltage has been dropping low, causing engine trouble and killing your AC system. Put a voltmeter on the battery terminals. With the engine running on a 2003+ model, you should see approximately 15 volts for a few minutes after starting, slowly tapering down around 13.5.

If that checks good, pour some coffee and work through this troubleshooting guide for the climate control system:

https://www.jaguarforums.com/forum/s...ol-how-185002/