What Does P2190 Mean?
The powertrain control module (PCM) has detected an excessively rich air/fuel mixture on Bank 2 cylinders during idle conditions. The oxygen sensors are reporting that the fuel mixture contains too much fuel or insufficient air when the engine is at idle.
Common Causes
35%
Leaking or faulty fuel injectors on Bank 2 allowing excess fuel delivery at idle
25%
Malfunctioning Mass Air Flow (MAF) sensor providing incorrect airflow readings
20%
Faulty oxygen sensors on Bank 2 providing incorrect feedback to PCM
15%
Excessive fuel pressure due to failed fuel pressure regulator or blocked return line
5%
Vacuum leaks or intake air leaks causing incorrect MAF readings
Diagnostic Steps
1
Step 1: Check live fuel trim data at idle to confirm excessive negative short-term fuel trim (STFT) on Bank 2
2
Step 2: Inspect all fuel injectors on Bank 2 for external leaks and perform injector balance test
3
Step 3: Measure fuel pressure at idle and compare to manufacturer specifications
4
Step 4: Inspect MAF sensor element for contamination and verify voltage/frequency output at idle
5
Step 5: Check oxygen sensor response time and voltage switching patterns on Bank 2 Sensor 1
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an excessively rich air/fuel mixture on Bank 2 cylinders during idle conditions. The oxygen sensors are reporting that the fuel mixture contains too much fuel or insufficient air when the engine is at idle.
The most common cause of P2190 (System Too Rich at Idle Bank 2) is: Leaking or faulty fuel injectors on Bank 2 allowing excess fuel delivery at idle
Typical repair costs for P2190 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive short distances but may experience rough idle, increased emissions, and potential catalytic converter damage if left unrepaired. Fuel economy will be significantly reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2190 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System and Emissions
Difficulty
Type
Generic (SAE)
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