Info on codes P2097 and p2099

[WHIPPLECHARGED]

Found some info on the codes I'm getting from installing headers.

DTC P2097 or P2099 (DI)


DTC Descriptors
DTC P2097

• Post Catalyst Fuel Trim System High Limit Bank 1

DTC P2099

• Post Catalyst Fuel Trim System High Limit Bank 2

Circuit Description

Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under light load conditions at a steady cruise. The engine control module (ECM) constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.

Conditions for Running the DTC

• Before the ECM can report DTC P2097 or P2099 failed, DTCs P0030, P0031, P0032, P0050, P0051, P0052, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P013A, P013C, P013E, P014A, P0140, P0141, P0150, P0151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P2232, P2235, P2270, P2271, P2272, and P2273 must run and pass.
• DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0420, P0430, P0442, P0443, P0455, P0458, or P0459 is not set.
• The engine speed is 1,280-3,480 RPM.
• The engine load is 17-65 percent and steady.
• The closed loop fuel control is active for greater than 1 second.
• The calculated exhaust gas temperature is greater than 250°C (482°F).
• DTCs P2097 and P2099 run continuously when the conditions above have been met for greater than 130 seconds.

Conditions for Setting the DTC

The rich correction limit for a condition causing a lean air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.

Action Taken when the DTC Sets

DTCs P2097 and P2099 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2097 and P2099 are Type B DTCs.

Diagnostic Aids

• An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
• An exhaust system leak that may not be audible can set this DTC

• Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information. Verify there is no other HO2S or fuel trim DTC set.

¤If any other HO2S or fuel trim DTC is set, refer to Diagnostic Trouble Code (DTC) List -

1. Verify that none of the following conditions exist:

• • Exhaust system leaks-Refer to Exhaust Leakage
  • Engine vacuum leaks
  • Low fuel system pressure-Refer to Fuel System Diagnosis
  • Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool)Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)
  • Lean fuel injectors-.

¤If you find any of the above conditions, repair as necessary.

[PieNsky]

Are the O2 sensors thermistors?

[WHIPPLECHARGED]

Originally Posted by PieNsky

Are the O2 sensors thermistors?

Thermistors are a resisitor that measure temperature.
O2 sensors operate off a slight voltage reading of .1 to .8 volts. They do have a heater used for cold start operation and they can read temperature of the exhaust. The cause of the code is the sensor is at the end of its limit for to long. My rear sensor stay at .8 volts most of the time which is causing the CEL to come on. Have to get the sensor to stay within the limits, with .5 volts being the optimum reading.

[KMPrenger]

So it all still boils down to your rear 02s just simply reading too rich correct? Do you think the 02 extenders I PMed you about would help?

[WHIPPLECHARGED]

Originally Posted by KMPrenger

So it all still boils down to your rear 02s just simply reading too rich correct? Do you think the 02 extenders I PMed you about would help?

I don't know if those will work. They claim to get rid of p0430 and p0420 codes, which I don't have anymore.

[PoorMansCamaro]

You are running into these code and all stock?

[PoorMansCamaro]

Maybe it's just bad o2 sensors?

[Archonlord]

I bought a couple of O2 Sensor spacers and have never gotten the 2097 or the 2099 with no tune. I get 0160 and 0158 on the passenger side but I don't think thats related to the O2 sensor extenders. Still working on figuring that on out.

[Archonlord]

Originally Posted by Jett10

quick question:

are the rear o2s interchangeable? can i swap the rear sensors to check if the code goes from 2099 to 2097? if so, that alone will pinpoint the failed sensor or point toward a bank2 fuel issue...all help is greatly appreciated

Unfortunately no the rear O2 sensors are not interchangeable.

[efpardo]

Anybody still getting these codes after maybe a long winter slumber?
I'm getting a p2099. Shop can't find any leaks and cleared it. Over the weekend it came back. Could this be a fuel problem? Carbon on the valves?

[markgws6]

I have the p2097 coming on again. It turned off sometime in winter and came back on during a highway trip. I think its been explained before here what causes it but my shop has welded my headers at the flanges so I doubt there is a leak there. I also have a tune installed.
Neither has fixed the issue. I wish I had an easy solution...

Originally Posted by efpardo

Anybody still getting these codes after maybe a long winter slumber?
I'm getting a p2099. Shop can't find any leaks and cleared it. Over the weekend it came back. Could this be a fuel problem? Carbon on the valves?

[bionick]

Originally Posted by markgws6

I have the p2097 coming on again. It turned off sometime in winter and came back on during a highway trip. I think its been explained before here what causes it but my shop has welded my headers at the flanges so I doubt there is a leak there. I also have a tune installed.
Neither has fixed the issue. I wish I had an easy solution...

Any resolution to this? I installed my solo HFC's as well as the rear o2 extenders. Everything appeared to be installed correctly. No CEL the first 5 days and I drove A LOT within those 5 days, then on my way to California (from Phoenix AZ) my CEL P2097 came on after driving about 3 1/2 hours or so. Haven't found a fix yet, just been researching. Bank 1 is driver side and it's the sensor after the cat from what I've read. I don't know if maybe I just need to tighten the sensor more or what

[bionick]

All I can really think of is a leak in the manifold but wouldn't that be an issue with the pre cat o2 sensor?

[markgws6]

As far as I know the only solution is to tune it out. Unfortunately I don't own this car anymore but the whole experience has made me very leary of messing with the exhaust pre-mufflers on these cars.

Originally Posted by bionick

All I can really think of is a leak in the manifold but wouldn't that be an issue with the pre cat o2 sensor?