The P2098 code on your 2022 Toyota Highlander indicates the post-catalyst fuel trim system on bank 2 is detecting persistent lean conditions. This code affects your Highlander's 3.5L V6 engine's emissions monitoring system, signaling the downstream O2 sensor on bank 2 consistently sees lean exhaust after the catalytic converter.
Understanding P2098 on Toyota Highlander
Code P2098 indicates the bank 2 downstream O2 sensor is reading lean. This could mean the actual exhaust is lean (upstream fuel issue), the catalyst is not functioning properly, or the downstream sensor itself is faulty. It's the bank 2 counterpart to P2096.
Common Symptoms
- Check engine light on
- May have no obvious performance issues
- Failed emissions test
- Possible slight fuel economy change
- Catalyst efficiency codes may accompany
- Engine runs normally in most cases
Primary Causes
- Faulty downstream O2 sensor reading lean
- Exhaust leak before downstream sensor
- Upstream fuel system running lean
- Catalytic converter issue
- Sensor wiring damage
- Air intrusion in exhaust system
Diagnostic Procedure for 2022 Highlander
Monitor both upstream and downstream O2 sensors on bank 2. If upstream shows normal readings but downstream is stuck lean, focus on the downstream sensor or exhaust leaks. Check for exhaust leaks between catalyst and sensor. Compare bank 2 sensor 2 readings to bank 1 sensor 2. Test downstream sensor response by enriching mixture. Inspect sensor wiring.
Repair Solutions
Replace faulty downstream O2 sensor if testing confirms sensor failure. Repair exhaust leaks that allow air intrusion. Address upstream lean conditions if present. If catalyst is damaged or failing, replacement may be needed. Repair sensor wiring issues. After repairs, clear codes and complete drive cycle to verify proper catalyst monitoring.