What causes a P2187 code?

Common causes: Vacuum leak; Dirty throttle body; Failed PCV.

What are the symptoms of a P2187 code?

Typical symptoms: Rough idle; CEL; Stalling at stops.

Yes — this code is generally safe to drive with, but address it soon to avoid escalation. Estimated repair: $50-$400.

OBD-II Code · Fuel & Air

System Too Lean at Idle (Bank 1)

medium severitySafe to drive$50-$400

Bank 1 runs lean specifically at idle.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: vacuum leak.
Cost & scope. $50-$400
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.

Look up another code

More free tools