P2189 OBD-II Trouble Code: Sys Too Lean at Idle Bank 2

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2189 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2189 code

P2189 is a diagnostic trouble code (DTC) for "Sys Too Lean at Idle Bank 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2189 DIAGNOSTIC Get a fair and transparent estimate upfront

P2189 trouble code definition

The most environmentally friendly and power efficient air-fuel ratio for gasoline engines that we modernly know is 14.7:1. The engine control module (ECM) is programmed to adjust things like fuel delivery and ignition timing if needed to keep the air-fuel ratio at or near the 14.7:1 ratio. Trouble code P2189 indicates that the ECM has determined that there is too much air and too little fuel present in the air-fuel ratio during engine idle.

What the P2189 code means

This code indicates that during the last two drive cycles, the ECM has observed a lean air-fuel ratio condition on bank 2 of the engine. The manufacture designed the ECM with the ability to adjust the air-fuel ratio by changing the ignition timing and fuel injection pulse width to help achieve 14.7:1. The ECM can only adjust the air-fuel ratio to a certain extent. If the margin of adjustment is too wide for the ECM to correct the lean condition, then a code P2189 will set.

What causes the P2189 code?

  • Faulty EVAP system purge valve
  • Vacuum leak
  • Faulty crankcase ventilation valve
  • Leaking crankcase ventilation valve grommet
  • Leaking intake manifold gaskets
  • Loose intake manifold
  • Faulty bank 2 oxygen sensor
  • Fuel pressure low due to weak fuel pump
  • Restricted fuel supply such as pinched fuel line or clogged fuel filter
  • Air intake leak
  • Loose oil cap
  • Faulty gas cap seal
  • Leaks in the exhaust system
  • Mechanical issue in one or more of the bank 2 fuel injectors
  • Faulty manifold absolute pressure sensor
  • Faulty fuel pressure regulator

What are the symptoms of the P2189 code?

  • Check Engine Light illumination
  • Misfire at idle
  • Engine hesitation
  • Engine hard to start, especially when warm
  • Whistling noises coming from the engine area

How does a mechanic diagnose the P2189 code?

  • Performing a fuel pressure test
  • Performing a fuel injector flow test
  • Inspecting the EVAP system for leaks
  • Inspecting the intake manifold for leaks
  • Inspecting the air intake and vacuum lines for leaks
  • Inspecting the crankcase ventilation grommet for leaks
  • Inspecting the rubber seal of the gas cap
  • Performing an inspection of the exhaust system
  • Using a scan tool to view the long and short-term fuel ratio
  • Using a scan tool to view the oxygen sensor live data

Common mistakes when diagnosing the P2189 code

Often times, a mechanic may not check the vacuum lines and EVAP system of the vehicle. The EVAP system and vacuum lines are among one of the most likely things to cause a lean condition.

How serious is the P2189 code?

It is fairly serious because an improper air-fuel ratio will generate excessive emissions, which will cause harm to the environment.

What repairs can fix the P2189 code?

Additional comments for consideration regarding the P2189 code

As there are many components which can cause this code, it is recommended to have an experienced technician point out the faulted component through proper testing and inspection to save time and money.

Need help with a P2187 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

trouble codes
P2189
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2189 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,829

Rating Summary
4,442
187
48
28
124
4,442
187
48
28
124

Walter

44 years of experience
64 reviews
Walter
44 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Tulsa, Oklahoma
Went above and beyond my expectations, as i was very nervous about this type of service! But to my surprise, I am absolutely satisfied with the service ! Would recommend 100X to all i know! Thanks for the care and information and time you put in to my qoute and truck@

Keith

16 years of experience
279 reviews
Keith
16 years of experience
BMW 535i xDrive - Check Engine Light is on - Kissimmee, Florida
Very personable, knowledgeable person, who provided information on my car that I was not aware of. The overall experience was great and I would definitely refer this company to my family and friends.

Luis

13 years of experience
20 reviews
Luis
13 years of experience
Audi A3 - Check Engine Light is on - Van Nuys, California
Luis was awesome. Very knowledgeable and a down to earth person. Would highly recommend and plan on using him in the future for any repair that I need!

Joel

19 years of experience
742 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

More related articles

Tips for Taking Care of Your Exhaust System
Your Your car’s exhaust system might not be the first thing you think about when it comes to engine performance or personal safety, but it should be pretty high on that list. Your engine combusts fuel and air in order...
B1908 OBD-II Trouble Code: Air Bag Crash Sensor #2 Ground Circuit Short to Battery
B1908 means there is a malfunction with the #2 airbag crash sensor circuit, likely due to a bad electrical component or defective sensor.
P0059 OBD-II Trouble Code: Heater Circuit Resistance (Bank 2 Sensor 1)
P0059 P0059 trouble code definition The definition of diagnostic trouble code p0059 is that the resistance for the heater circuit of bank 2 sensor 1 oxygen sensor is not correct. What the P0059 code means When this trouble code sets...

Related questions

Check engine light keeps coming back on

Hello. I would need to know the exact codes to be able to give good information about this. If you have a reoccurring misfire code, then a compression test needs to be done to see if there is an internal...

Engine light coming on

The diagnosis by another place may be correct, however, the Check Engine Light can go on for many reasons. If you'd like to have a second opinion on the Engine Light or have this service done for you, consider YourMechanic....

Check Engine Light keeps appearing, trouble code changed

Hi there, thanks for writing in. Having a professional mechanic complete a diagnostic inspection to determine why a mechanical part failure continues to happen is always the best course of action; especially if you're frequently replacing spark plugs on a...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com