AutoCodes – Generic – P2189

P2189 Code - System Too Lean At Idle Bank 2

Quick Answer

In order to provide the best possible combination of drivability, fuel economy and emission control, the Powertrain Control Module (PCM) uses a closed loop air/fuel metering system. Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2189 indicates System Too Lean At Idle Bank 2.
Common causes: Common causes include Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 25,257

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2189 Description

In order to provide the best possible combination of drivability, fuel economy and emission control, the Powertrain Control Module (PCM) uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based it in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition.

OBDII Code P2189 - System Too Lean At Idle Bank 2 - AutoCodes.com — P2189 Code - System Too Lean At Idle Bank 2

What does this mean?

What are the Possible Causes of the DTC P2189?

Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection

How to Fix the DTC P2189?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2189 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2189 code?

Need more information on how to fix the P2189 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2189 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2189 Audi — System Too Lean At Idle Bank 2
P2189 BMW — System Too Lean At Idle Bank 2
P2189 Dodge — System Too Lean At Idle Bank 2
P2189 Hyundai — System Too Lean At Idle Bank 2
P2189 KIA — System Too Lean At Idle Bank 2
P2189 Mazda — System Too Lean At Idle Bank 2
P2189 MINI — System Too Lean At Idle Bank 2
P2189 Volkswagen — System Too Lean At Idle Bank 2
P2189 Volvo — System Too Lean at Idle Bank 2

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2189 Code

1. What does the OBDII code P2189 mean?

P2189 indicates that the engine control module (ECM) has detected a lean air-fuel mixture at idle on Bank 2 of the engine.

2. What are the common symptoms of a P2189 code?

Symptoms may include rough idling, stalling at idle, decreased fuel efficiency, a check engine light, and possible hesitation during acceleration.

3. What causes the P2189 code to appear?

Common causes include vacuum leaks, faulty fuel injectors, a dirty mass airflow sensor, a failing oxygen sensor, or exhaust leaks near Bank 2.

4. Can a dirty air filter cause the P2189 code?

While unlikely, a severely dirty air filter could restrict airflow and contribute to a lean condition, though it is not the most common cause.

5. How do I diagnose a P2189 code?

Start by checking for vacuum leaks, inspecting the intake system, testing the oxygen sensors, and ensuring the fuel injectors on Bank 2 are functioning properly.

6. Is it safe to drive with a P2189 code?

Driving with a P2189 code is not recommended as it can lead to poor engine performance, increased emissions, and potential damage to engine components if unresolved.

7. How do I fix the P2189 code?

Repairs may involve sealing vacuum leaks, cleaning or replacing the mass airflow sensor, repairing exhaust leaks, or replacing faulty oxygen sensors or injectors.

8. Can a bad fuel pump cause the P2189 code?

Yes, a weak fuel pump can result in insufficient fuel delivery, leading to a lean condition and triggering the P2189 code.

9. Which side of the engine is Bank 2 for the P2189 code?

Bank 2 refers to the side of the engine that does not contain cylinder 1, typically on V6, V8, or other multi-bank engines.

10. Will clearing the code fix the P2189 issue?

No, clearing the code will only temporarily turn off the check engine light. The underlying issue must be resolved to prevent the code from returning.