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Persistent P2098 code

Tiger38117

Member
Joined
Dec 28, 2016
Messages
18
Location
Memphis, TN
I have a persistent p2098 code (lean bank 2 downstream). Have replaced O2 sensor twice. Have also replaced the following recently to solve other problems:

Upstream bank 2 sensor
intake gaskets
plenum hose

The car runs beautifully, idles smooth, good gas mileage, no indications that anything is wrong except the CEL glowing.

Anyone else encounter this?

Thanks
 

rexster314

Seasoned Member
Joined
Oct 2, 2015
Messages
1,430
Location
West Columbia, Texas
My XLR/V(s)
2006 Base Infrared
These engines are sometimes finicky. First thing to do would be to check and make sure all the intake manifold bolts are tight
 

XLR-SAM

New Member
Joined
Feb 19, 2012
Messages
3
Location
Rancho Cucamonga
My XLR/V(s)
2006 XLR INFRA RED/SHALE
I have a persistent p2098 code (lean bank 2 downstream). Have replaced O2 sensor twice. Have also replaced the following recently to solve other problems:

Upstream bank 2 sensor
intake gaskets
plenum hose

The car runs beautifully, idles smooth, good gas mileage, no indications that anything is wrong except the CEL glowing.

Anyone else encounter this?

Thanks
 

XLR-SAM

New Member
Joined
Feb 19, 2012
Messages
3
Location
Rancho Cucamonga
My XLR/V(s)
2006 XLR INFRA RED/SHALE
I have 2006 XLR, and I recently encountered this code as well. P2098, we took it to the dealership, and he indicated the exhaust manifold/converter needs to be replaced, $1300. The problem is the part is on backorder with no date of availability. I will need to contact GM, my concern is that they are not making this part anymore. What options do I have to fix?
 

XLR-SAM

New Member
Joined
Feb 19, 2012
Messages
3
Location
Rancho Cucamonga
My XLR/V(s)
2006 XLR INFRA RED/SHALE
Thanks for the suggestion, I read on other threads that my problem may be related short drives that does not get the catalytic converter hot enough. I bought a bottle of CATACLEAN. Going to try this, will post the results. It may help other XLR owners.
 

James Landi

Seasoned Member
Joined
May 21, 2017
Messages
117
Location
Camden, Maine, and Melbourne, Fl.
My XLR/V(s)
2007 (red) with wire grrile
Yes, you must be careful. On our Cadillac SRX, we replaced both cat/converters with aftermarket items. When the check engine light went on again after a couple of hundred miles, the garage said "we should try new oxygen sensors... Check engine light came on again, after a few hundred miles. Next, just before the annual inspection I dumped in the Cat-clean magic potion--- worked for a week or two, and we passed inspection-- (of course, the check engine light is ON again). I'm thinking we dumped a couple of thousand dollars in parts/labor, and the infernal light keeps coming on--- so yes, I'd try the Cat/clean snake oil, and see if the damn light goes out. James
 

pure zen

Seasoned Member
Joined
Mar 12, 2014
Messages
827
Location
AZ
My XLR/V(s)
2005 Crimson Pearl XLR
That has to be very frustrating...... Best tell the tech that you aren't paying for "Guess Repair"




checkengine 2.jpg
 

James Landi

Seasoned Member
Joined
May 21, 2017
Messages
117
Location
Camden, Maine, and Melbourne, Fl.
My XLR/V(s)
2007 (red) with wire grrile
Appreciate your advice, Pure Zen. It appears that some of these computer/electronic monitoring systems are far from fail safe, and apparently what is coming out of the tail pipe may not be an issue when the code and light say otherwise. Of course, when faced with no alternative, you say, "Sure, change out the parts, and you assume that doing so will solve the problem, and when it doesn't, how can you justify not paying for all the work and effort the techs expended in good faith. I keep thinking that there must be some kind of work around to "fool" the computer-- as most of these "systems" work on measuring differences in resistance... Used to be that the measurement of noxious fumes from cars was determined by a probe in the tail pipe at inspection time. The entire issue of the "check engine light" is a real puzzlement, as our 1999 Ford EXPLODER with 185,000 has never registered a check engine light in our 21 years of ownership ...go figure. James
 

xlrlist01

Seasoned Member
Joined
Oct 31, 2013
Messages
255
Location
HSV
The Cadillac workshop manuals have generally been written to minimize the cost of repairs, with careful sequences of tests before reaching the 'change module' option.
 

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