Can a leaking injector cause P0152?

Yes — a leaking injector on bank 2 adds extra fuel, causing a real rich condition the O2 sensor correctly detects.

How to tell if it is the sensor or injector?

Check fuel trim: if the ECM is trimming fuel down heavily on bank 2, it is a real rich condition (injector). If trims are normal, the sensor is lying.

P0152

Medium Severity

O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)

Emissions System

What Does P0152 Mean?

Upstream O2 sensor bank 2 reads too high (rich).

Common Fix

Replace O2 sensor

Estimated Cost (DIY)

$30 - $100

Symptoms

⚠️Rich running on bank 2
⚠️Black smoke from one side
⚠️Fuel smell

Common Causes

Failed O2 sensorlikely

Leaking fuel injector on bank 2possible

High fuel pressurepossible

How to Diagnose P0152

1Monitor O2 sensor voltage
2Check fuel trim bank 2
3Inspect injectors for leaks
4Replace sensor

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Related Codes

P0150 P0175 P0151

Frequently Asked Questions

Can a leaking injector cause P0152?: Yes — a leaking injector on bank 2 adds extra fuel, causing a real rich condition the O2 sensor correctly detects.
How to tell if it is the sensor or injector?: Check fuel trim: if the ECM is trimming fuel down heavily on bank 2, it is a real rich condition (injector). If trims are normal, the sensor is lying.

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