bad O2 sensor causing misfires and PTE tstat failed

Oct 12, 2009 | 06:04 PM

e55 baller

Thread Starter

MBWorld Fanatic!

Joined: May 2004

Posts: 1,197

Likes: 1

W221 S65 AMG

bad O2 sensor causing misfires and PTE tstat failed

Just had some warranty work done, a faulty 02 sensor was causing cyl 1, 3, 4 to misfire, weird. Didn't think it could do that.

Also had to have my tstat replaced as the PTE one failed. Strange.

Oct 12, 2009 | 06:15 PM

Yacht Master

MBWorld Fanatic!

Joined: Oct 2006

Posts: 3,642

Likes: 13

From: Caribbean/Florida/Colorado

E-ZGO 53hp., 1999 E 430 sport, 2004 E 55, 2008 Tahoe LTZ on 24"s

Quote:

Originally Posted by e55 baller

Just had some warranty work done, a faulty 02 sensor was causing cyl 1, 3, 4 to misfire, weird. Didn't think it could do that.

Also had to have my tstat replaced as the PTE one failed. Strange.

I would think a MB dealer would find a running cool condition and blame a tstat, if that was the case.

Oct 12, 2009 | 06:53 PM

e55 baller

Thread Starter

MBWorld Fanatic!

Joined: May 2004

Posts: 1,197

Likes: 1

W221 S65 AMG

Quote:

Originally Posted by Yacht Master

I would think a MB dealer would find a running cool condition and blame a tstat, if that was the case.

I also got codes that it was running too cool then got a coolant leak, MB said it was tstat related? hmmm.

Oct 13, 2009 | 03:12 AM

Marcus Frost

MBWorld Fanatic!

Joined: Jul 2003

Posts: 2,123

Likes: 3

From: Chicago, IL

Real Cars

Modified t-stat + big H/E will throw those codes... I get a code now and then for car not getting up to operating temp with just my H/E...

-m

Oct 13, 2009 | 11:16 AM

prodigymb

MBWorld Fanatic!

Joined: Jul 2008

Posts: 2,172

Likes: 3

From: Philly

997TT, C192 GT63, W464 G550, MS Plaid

i've been getting a coolant leak from the high pressure system too. can't quiet narrow down what's leaking.

i get those codes occasionally too especially in the cold, but thats just what you have to deal with if you want to run a cooler TSTAT

Oct 22, 2009 | 10:36 AM

Mrbig

Senior Member

Joined: Jun 2007

Posts: 435

Likes: 0

Really ok, my car too was running great and then out of the blue check engine came on and codes read misfire, u think its from car running cooler no real issue i was kinda of nervous. Or the pte went bad ?

Oct 22, 2009 | 11:59 AM

mekantor

Super Member

Joined: Feb 2009

Posts: 692

Likes: 73

From: Houston, TX

2003 E55 AMG; 2013 GL550 4Matic; 2003 CL600

I've got an occasional miss and a 0106 code whenever that happens, which is like a O2 bank 2 rich IIRC, also get high idle / running rich codes. Were you having similar issues?

I was thinking bad coil, but maybe I'll change that sensor instead.