P2188 — System Too Rich at Idle (Bank 1)
Category: Powertrain Severity: Medium
Updated:
DTC code P2188 means: System Too Rich at Idle (Bank 1). It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include leaking injector, eVAP purge valve stuck open and high fuel pressure; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Leaking injector
- EVAP purge valve stuck open
- High fuel pressure
- MAF reading low
Symptoms
- Fuel smell
- Rough idle
- Hard hot starts
- Check engine light
How to diagnose it step by step
- Test the purge valve.
- Measure fuel pressure.
- Check injectors.
- Check the MAF.
How to fix it
Check the canister purge valve (a very common cause), then fuel pressure and injectors.
Estimated repair cost
Purge valve: $40–150. Injector: $100–400.
Frequently asked questions
What does DTC code P2188 mean?
System Too Rich at Idle (Bank 1).
Is code P2188 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P2188?
Yes, short term.
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