My 2003 Hyundai Accent computer was read due to the Check Engine light coming on. The code that came up was a p2096-Post Catalyst Fuel System Too Lean. The guy said he never saw that code come up before but it has something to do with the exhaust and the emissions having too little fuel. What will I need to get replaced on my car?

P2096 OBD II Trouble Code Post Catalyst Fuel Trim System Too Lean Bank 1... https://repairpal.com/obd-ii-code-p2096-post-catalyst-fuel-trim-system-too-lean https://www.obd-codes.com/p2096

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The code P2096, post catalyst fuel trim system too lean on bank 1 simply translates to a lean (too much air and not enough fuel) condition the PCM recognized through the signals from the oxygen sensors. Bank 1 has no meaning on a four or straight six cylinder engine with a single exhaust. On a V-6 or V-8 engine it refers to the oxygen sensor on the number one cylinder side of the engine as bank 1.
A series of oxygen sensors in the exhaust system signal the fuel mixture ratio at all times. Each exhaust system with a catalytic converter will have two sensors -- one between the engine and the converter and one after the converter.
Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. The higher the oxygen content the leaner the fuel mixture, conversely the opposite is a rich mixture. It does so in a series of pulses called "cross counts." There is zirconium on the tip of the sensor that reacts to oxygen in a way that when hot, creates its own voltage. It must be around 250 degrees F to operate and will produce up to 0.8 volts.
In operation the oxygen sensor will cycle once every second and send a voltage to the computer that ranges from 0.2 rich to 0.8 for a rich mixture. The perfect mixture will average the signals around 0.45 volts. The computer's target fuel/air ratio is 14.7:1. An oxygen sensor will not function at low temperatures such as start up -- for this reason most forward sensors have a pre-heater to reduce their warm up time.

Hi there:
DTC P2096 - Post Catalyst Fuel Trim System Too Lean (Bank 1)

Lean mixture code could be caused by a leakage in the rubber boot that is between the throttle body (similar to a carburetor) and the air cleaner housing. Following are all the tests to be done for a vehicle other than yours... HERE.

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This is Subaru's definition for this code... DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1; check this diagram about muffler assembly...

Fuel trim too lean. Usually means vacuum leak. Look for crushed,broken or melted off vacuum hoses near intake manifold. Or an obvious hissing noise at a normal idle. If so replace or repair clear codes your done. If not obvious take carb cleaner spray with nozzle attached car running & go over all vacuum hoses,intake manifold,egr valve see if idle raises if so you found leak. Repair. Could also be bad oxygen sensor switching bad o2 sensor but rarely.

Post catalyst fuel trim too lean. You can get this if youre running your vehicle on LPG fuel.

The code.... P2096.... Post Catalyst Fuel Trim System Too Lean, Bank 2... If this has been repaired you can turn off the light with a scanner tool.....

P2096=Post Catalyst Fuel Trim System Too Lean Bank 1,
drivers side was too lean at one time and set code,You should hhave the code erased and see if it returns again,

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

P2096= Post Catalyst Fuel Trim System Too Lean

P0137= O2 sensor voltage low bank 1 sensor 2