What usually causes it
- A vacuum leak, like a cracked hose or a loose intake pipe
- A leaking intake gasket or PCV hose
- A dirty air flow sensor (MAF)
- Weak fuel delivery, like a clogged filter or a weak pump
P2187Starts at: OK to drive, fix when convenient
Engine runs lean at idle (bank 1)
At idle, the engine is getting too much air or not enough fuel on bank 1, the side with cylinder 1. The computer is adding extra fuel and has hit its limit.
Check this first
Listen for a hissing sound near the engine at idle, and look for cracked rubber hoses.
What to watch for
- A rough or shaky idle
- Stalling when you stop
- A flashing check engine light, which means a bad misfire
Can I keep driving?
We rate P2187 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
Quick answers about P2187
What does P2187 mean?
Engine runs lean at idle (bank 1). At idle, the engine is getting too much air or not enough fuel on bank 1, the side with cylinder 1. The computer is adding extra fuel and has hit its limit.
Can I keep driving with P2187?
We rate P2187 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
What usually causes P2187?
The most common causes, in order: A vacuum leak, like a cracked hose or a loose intake pipe; A leaking intake gasket or PCV hose; A dirty air flow sensor (MAF); Weak fuel delivery, like a clogged filter or a weak pump.
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.