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post #1 of 10 (permalink) Old 10-16-2008, 08:20 PM Thread Starter
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More Problems / code p0420

So to bring everyone up to speed in the last 2200 miles my motor was replaced, twice. Read about it here.

Then after about another 1100 miles the water pump failed.

On Oct 1st the check engine light came on. That was for the catalyst system, code p0420. Read about that here. I hoped that the O2 sensor just had a quirk.

Then yesterday as I was considering posting that my check engine light had not returned. It returned....with a vengeance.

I now have the same code as before, catalyst system, as well as a new one p0300, Random/Multiple Cylinder Misfire Detected.

So we're off to see the dealer first thing tomorrow. The service manager said it could be related to the motor swap but he will have to figure out what is component is setting the code.

I know it is probably overboard but I'm ready to trade. I really like my XK but this stuff is getting old fast.

On the bright side I found a great website for OBD-II codes. It is http://www.obd-codes.com/
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post #2 of 10 (permalink) Old 10-16-2008, 08:28 PM
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Lemon Law?
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post #3 of 10 (permalink) Old 10-16-2008, 08:30 PM Thread Starter
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I am not the original owner. Evidently in IL that matters.
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post #4 of 10 (permalink) Old 10-16-2008, 08:37 PM
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Damn, that sucks. Looks like you got all the broken parts that we didn't. Thanks for taking on for the team!

RIP - Silver '06 Limited; 5.7 Hemi; 2" TerraFlex Lift; 255/70R17 Bridgestone Dueler REVOS, Horizontal Inclinometer, Signal Frog Antenna Ball, Surco Safari 50"x50" Roof Rack, GetLost4x4 bumper, Bulldog 9k Winch, GetLost4x4 Rock Rails - (should have added a snorkel)
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post #5 of 10 (permalink) Old 10-16-2008, 09:05 PM
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Damn, I think you keep getting the motors that are being built at 4:30 on a friday afternoon
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post #6 of 10 (permalink) Old 10-16-2008, 09:08 PM
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I think you were just unlucky with your commander. There are many guys out there that have not had one problem yet. I hear where you are coming from though. Id be quite upset after the first engine replacement.




2007 4.7 Liter XK | Front OME MD Springs w/Superlift Preload Spacer | Rear 4" Superlift Springs | Bilstein 5125 Rear Shocks | JBA UCA's | Rusty's Rear Adjustable Track Bar | Black Rock 997 Wheels | Fred Goeske 1/4 Inch Wheel Spacers | 305/70R17 Goodyear Wrangler MT/R w/Kevlar | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front E-Locker | Rear Heat/AC Delete
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post #7 of 10 (permalink) Old 10-17-2008, 02:56 PM Thread Starter
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So the dealer checked it out and told me that as far as the misfire goes "it is not active" and there was no catalyst code stored. So they flashed the PCM with an update. I thought that was kinda weird as they did that recently because of the recall for stalling issues. But whatever...they are the experts

It seems to have worked for now but we will see.
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post #8 of 10 (permalink) Old 10-17-2008, 11:56 PM
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Quote:
Originally Posted by jcoulter View Post
So the dealer checked it out and told me that as far as the misfire goes "it is not active" and there was no catalyst code stored. So they flashed the PCM with an update. I thought that was kinda weird as they did that recently because of the recall for stalling issues. But whatever...they are the experts

It seems to have worked for now but we will see.
Wishing you the best of luck
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post #9 of 10 (permalink) Old 10-18-2008, 07:35 AM
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Man....... sorry you have having such a hard time. I havent had one problem with my Commander. I did the recalls, but never had a stall. It was 1 quart low of trans fluid when I bought it and topped it off right away which may have eliminated some of the early problems, but other than that, it has been fine. Hope you can get this sorted out, maybe the dealer can just do an even swap for you? I'd definately be looking at a lawyer.
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post #10 of 10 (permalink) Old 10-20-2008, 08:31 PM Thread Starter
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So over the weekend the check engine light came back on, code p0420 again. Got it in today and they told me that the catalytic converter needs to be replaced. They will call when it comes in.

They made sure to tell me that it would take a couple of hours as it wood need to cool off before they would work on it. Like I expected them to work on a hot exhaust.

Anyway they have an '07 on the lot marked down to $23,000. I think I paid $21,000 for mine one year ago. Since the '07 is a Limited with just about everything except navigation I'm really considering trading. Then I could save up for the Superlift and GL 4x4 accessories.
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