How much does it cost to fix P2098?

DIY repair typically costs $20–$200 for parts. Professional repair runs $150–$800 including parts and labor.

P2098

Powertrain

Moderate

Post Catalyst Fuel Trim System Too Lean (Bank 2)

What could P2098 mean for your vehicle?

Add your vehicle to explore possible causes and next checks. AI guidance helps you investigate; it does not confirm a diagnosis.

The P2098 code is the bank 2 counterpart of P2096. It indicates that the powertrain control module has detected a lean condition in the exhaust mixture downstream of the catalytic converter on bank 2 (the side of the engine that does not contain cylinder 1). This code is only applicable to vehicles with V-configuration or horizontally-opposed engines that have two exhaust banks.

The causes and diagnosis are essentially the same as P2096, but focused on the bank 2 side of the exhaust system. Exhaust leaks on the bank 2 exhaust manifold or downpipe are a primary suspect, as are failing oxygen sensors and vacuum leaks near bank 2 cylinders.

If you see P2098 alongside P2096 (both banks lean), the problem is likely a shared system issue such as a weak fuel pump, dirty MAF sensor, or overall vacuum leak, rather than a bank-specific problem. If only P2098 is present, focus your diagnosis on bank 2 exhaust components and oxygen sensors. Address this code within a week to prevent catalytic converter damage.

Severity

Moderate — Address SoonThis Week

Symptoms

•Check engine light on
•Rough or unstable idle
•Hesitation during acceleration
•Reduced fuel economy
•Possible misfires under load or at highway speeds

Likely Causes

Exhaust leak before the bank 2 downstream oxygen sensor30%

An exhaust leak on the bank 2 side between the engine and the post-catalyst O2 sensor introduces ambient air into the exhaust, creating a false lean reading at the sensor.

Failing bank 2 downstream oxygen sensor25%

The post-catalyst oxygen sensor on bank 2 can degrade over time, becoming sluggish or biased toward lean readings, causing the PCM to flag a lean fuel trim condition.

Vacuum leak affecting bank 2 cylinders25%

A vacuum leak near the bank 2 intake runners — such as a cracked intake manifold gasket or broken vacuum hose — introduces unmetered air into those cylinders, creating a genuine lean condition.

Fuel delivery issue affecting bank 220%

Clogged fuel injectors on bank 2 cylinders, a weak fuel pump, or a restricted fuel filter can reduce fuel delivery, resulting in a lean mixture detected by the downstream sensor.