Pontiac Grand Am P2187: Bank 1 A/F Mixture Too Lean”
P2187 is a DTC code that can occur in the Pontiac Grand Am. It indicates the air fuel mixture is too lean at idle. The technical definition for P2187 “System Too Lean at Idle: Bank 1”. The code is thrown after your Grand Am’s oxygen sensor on Bank 1 (usually sensor 1) has detected that … Read more