P2099 — Post Catalyst Fuel Trim System Too Rich (Bank 2)
Category: Powertrain Severity: Medium
Updated:
DTC code P2099 means: Post Catalyst Fuel Trim System Too Rich (Bank 2). It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include failed bank 2 downstream sensor, spent bank 2 catalyst and leaking bank 2 injector; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Failed bank 2 downstream sensor
- Spent bank 2 catalyst
- Leaking bank 2 injector
Symptoms
- Check engine light
- Rotten-egg smell
How to diagnose it step by step
- Check bank 2 fuel trims.
- Watch the sensors.
- Check injectors.
- Evaluate the catalyst.
How to fix it
Same as P2097 applied to bank 2.
Estimated repair cost
$100–2,000.
Frequently asked questions
What does DTC code P2099 mean?
Post Catalyst Fuel Trim System Too Rich (Bank 2).
Is code P2099 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P2099?
Yes, short term.
Related codes
P2098 P2097 P2096 P20EE P2004 P2002
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