P2187 — System Too Lean at Idle Bank 1

What Does P2187 Mean?

P2187 is a diagnostic trouble code indicating: System Too Lean at Idle Bank 1. This code relates to the powertrain system. It has been reported in NHTSA complaints across 2 different vehicle models.

Common Causes

🔍 Failed or deteriorated catalytic converter
🔍 Weak or failing fuel pump
🔍 Clogged or leaking fuel injector
🔍 EVAP system component failure
🔍 Loose or damaged gas cap
🔍 Sensor or control module malfunction

P2187 Reports by Year

2022

1

2012

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I BEGAN TO HAVE PROBLEMS WITH THE ENGINE LIGHT. EVERY TIME I HAD IT CHECKED, IT CODED SOMETHING DIFFERENT (PO455, PO171, PO441) WITH THESE RESULTS: FUEL CAP LIGHT CAME ON, HIGH PRESSURE FUEL PUMP, EVAPORATIVE EMISSION CONTROL SYSTEM , AND LEAN BANK 02 CENSOR BEFORE THE CATALYTIC CONVERTER. IT BECA"
— Volkswagen Passat owner, 02/03/2012

"My Honda Accord Sport has only 47,500 miles and it needs a new Fuel Rail. Code P2187. I have had Hondas for over 20 years and this has never happened before. I read that some 2018 honda model had extended warranty for Fuel Injectors. The Honda Accord should fall under that extended warranty."
— Honda Accord owner, 05/06/2022

Source: NHTSA Complaints Database

Most Reported Vehicles for P2187

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	HONDA ACCORD
2	VOLKSWAGEN PASSAT

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Check and tighten the gas cap — replace if cracked or damaged ($5-15)
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2187: System Too Lean at Idle Bank 1