Heated Oxygen Sensor Circuit Out of Range Bank 2 Sensor 1 (Ford)
What does P1152 mean?
The P1152 code means the vehicle's onboard diagnostic system has detected: Heated Oxygen Sensor Circuit Out of Range Bank 2 Sensor 1 (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Poor fuel economy
- Rough idle or misfiring
- Rich or lean exhaust smell
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Faulty upstream O2 sensor on Bank 2 Very High
- Exhaust leak at exhaust manifold or header High
- Fuel pressure too high or too low Moderate
- Vacuum leak on Bank 2 side of intake Moderate
- Wiring damage between sensor and PCM Low
Step-by-Step Diagnostic Procedure
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Monitor Bank 2 Sensor 1 O2 readings with a scan tool during idle and acceleration
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Check for exhaust leaks near the Bank 2 exhaust manifold
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Inspect for vacuum leaks on the Bank 2 intake runners
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Test fuel pressure and compare to specifications
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Replace the upstream O2 sensor if readings are erratic or out of range
Frequently Asked Questions
What does out of range mean for P1152?
Out of range means the Bank 2 upstream O2 sensor voltage is reading above or below what the PCM expects under normal operating conditions. This prevents accurate fuel trim adjustments on Bank 2.
Can an exhaust leak cause P1152?
Yes. An exhaust leak before the sensor allows fresh air to reach the sensor, making it read lean. This is a common cause on Ford trucks with cracked exhaust manifolds, especially on the passenger side.
How do I identify Bank 2 on my Ford?
On most Ford V6 and V8 engines, Bank 1 contains cylinder 1 (passenger side on most models). Bank 2 is the opposite side. Check your service manual for your specific engine, as configurations can vary.