P2098Fuel & Air Metering

Post Catalyst Fuel Trim System Too Lean Bank 2

P2098 is the Bank 2 version of the post-catalyst too lean fault. The downstream O2 sensor on Bank 2 reports a persistently lean exhaust. Common causes are an exhaust leak, a failing rear O2 sensor, or an actual lean running condition.

🚗 Yes, short-term, but a lean condition can damage the catalytic converter over time.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Exhaust leak before/near the rear O2 sensor$50-$400

40%

Fresh air pulled in through a leak skews the Bank 2 sensor lean.

#2Failing downstream O2 sensor$60-$300

30%

A lazy or contaminated post-cat sensor reports false lean readings.

#3Actual lean condition (vacuum leak, weak fuel delivery)$50-$600

20%

Check for vacuum leaks and fuel pressure if upstream trims are also high.

🩺 Common Symptoms

Check engine light on
Possible minor drop in fuel economy
May fail an emissions test
Often no noticeable drivability change

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$300

Shop Cost

$150-$650

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2098

1Scan for lean codes such as P0174 that change the diagnosis

2Smoke-test the Bank 2 exhaust near the rear O2 sensor

3Check the downstream O2 sensor live data and heater circuit

4Inspect for vacuum leaks and verify fuel pressure

❓ Frequently Asked Questions

Can I drive with a P2098 code?

Short-term yes, but fix it within a few weeks. A lean reading can shorten catalytic converter life and fail emissions.

How much does it cost to fix P2098?

Most fixes run $150 to $650 at a shop, or $50 to $300 as a DIY exhaust gasket or O2 sensor repair.

What is the most common cause of P2098?

A small exhaust leak near the Bank 2 rear O2 sensor is the most common cause, followed by a failing sensor.

🔗 Related Codes

P2096P2097P2099P0174P0430