Engine code p2096

code p 0133 is the heated oxygen sensor (HO2S)1 bank 1 so response --no response or--no signal=== causes wiring--heating inoperative---HO2S -- o2 sensor ( oxygen sensor
the HO2S is in the exhaust manifold before the cat converter and the O2 sensor is after the cat converter
the code p 2096also refers to the HO2S --wiring short to positive --cat converter--exhaust leak ( possible the flex section in the exhaust pipe before the cat converter

code p 2096 refers to post cat converter fuel trim(FT) bank 1 ---too lean===causes --cat converter---exhaust leak
it also refers to heated oxygen sensor (HO2S) 1 bank 1--range/ performance --circuit high====causes --wiring short to positive ---HO2S
replace the HO2S using the correct socket so the wires do not get damaged
for the first one check for an exhaust leak in the flex section of the exhaust pipe under the steel mesh

Trouble Code: P2096

Downstream Fuel System 1/2 Lean
Possible Causes:


Exhaust leakEngine mechanical problemO2 Sensor has failedO2 Sensor signal circuit or return circuit problemFuel contamination

Take it to a muffler shop-that mechanic must have a tin ear. I thought my Sentra had a small exhaust leak (slightly loud exhaust noise) from a previously fixed exhaust connection. But a muffler shop guy showed me I had a rusted out catalytic converter. I would suspect your flex pipe may still be leaking.

non OEM spark plugs can cause random misfire codes another possibility is a bad crankshaft sensor and or mass air flow sensor is dirty

Trouble Code: P2096

Downstream Fuel System 1/2 Lean

Trouble Code Conditions: Engine running in closed loop mode. Ambient/battery temperature above 20F (-7C). Altitude below 8500 feet. Fuel level is more than 15%. If the PCM adds downstream short-term compensation to long-term adaptive, and a certain percentage is exceeded for 2 trips, a freeze frame is stored, the MIL illuminates and a DTC is set.

Possible Causes:


Exhaust leakEngine mechanical problemO2 Sensor has failedO2 Sensor signal circuit or return circuit problemFuel contamination

P2096 is Post Catalyst Fuel Trim System To Lean Bank 1.
In most cases this code refers to a bad O2 sensor in the exhaust. Due to year etc, senor replacement. here is the technical info for the code. Indicating O2 sensor 1/2 meaning bank 1, sensor 2 plus shows other posssibles

SET CONDITION
If the PCM multiplies short term compensation by long term adaptive as well as a purge fuel multiplier and the result is below a certain value for 30 seconds over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES
Exhaust leak
Engine mechanical
1/2 O2 Sensor
(K141) O2 Sensor 1/2 signal circuit
(K299) O2 1/2 Heater control circuit
(K904) O2 Return downstream circuit
Fuel contamination

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Initial Inspection and Diagnostic Overview\Initial Inspection

DIAGNOSTIC TEST
1. ACTIVE DTC

NOTE:
- Check the vehicle repair history. If the 1/2 O2 Sensor has been replaced make sure that the O2 sensor was properly installed and meets OEM specification.
- Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.

Ignition on, engine not running.
With a scan tool, read DTCs.

Q: Is the DTC active at this time?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See: Component Tests and General Diagnostics Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test


2. EXHAUST LEAK
Turn the ignition off.

WARNING: TO AVOID PERSONAL INJURY FROM THE EXHAUST SYSTEM BEING HOT, ALLOW THE EXHAUST TO COOL DOWN TO A SAFE TEMPERATURE BEFORE PERFORMING A PHYSICAL INSPECTION. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY OR DEATH.

Visually and Physically inspect the exhaust system for holes, cracks, and blockage in the exhaust system.

Q: Is the exhaust system is good condition?

YES: Go To 3
NO: Repair or Replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test


3. ENGINE MECHANICAL
Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leak
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

Left side exhaust, 2nd O2 sensor back just after cat converter



- Raise and support vehicle.
- Disconnect wire connector from O2S sensor.

CAUTION: When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.

- Remove O2S sensor with an oxygen sensor removal and installation tool.
- Clean threads in exhaust pipe using appropriate tap.

INSTALLATION
Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.

Install O2S sensor. Tighten to 30 N-m (22 ft. lbs.) torque .
Connect O2S sensor wire connector.
Lower vehicle.


Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

It could be all of the things mentioned in your post. A loose/bent/misplaced heat shield will make noise at different engine speeds as various parts vibrate and (((RESONATE))) in harmony with engine speed. Also, a shifted/loose catalyst brick in the converter can be the culprit. If you KNOW for a fact that it IS an internal fault of the converter, it will need to be replaced. Chunks can be broken off as it rattles about and **** sideways downstream in the exhaust. This not only blocks exhaust, but can lead to a dangerous burn-through condition if the piece of hot catalyst wedges in a bend in the pipe where yo do NOT have additional heat shielding.

P2096 - Post Catalyst Fuel Trim System Low Limit.

Possible Causes
EXHAUST LEAK
ENGINE MECHANICAL PROBLEM
1/2 O2 SENSOR
(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT
(K299) O2 1/2 HEATER CONTROL CIRCUIT
(K904) O2 DOWNSTREAM RETURN CIRCUIT
FUEL CONTAMINATION

Here is more information about P2096
P2096-DOWN STREAM FUEL TRIM LEAN BANK 1

WHEN MONITORED 
With the engine running in closed loop mode, the ambient/battery temperature above (-7°C) 20°F , altitude below 8500 ft and fuel level greater than 15%.

SET CONDITION 
If the PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

Here are some possible casuses:
Exhaust leak
Engine mechanical problem
02 sensor
02 signal circut
02 return circut
Fuel contamination

Good luck and hope this helps.