Heated Oxygen Sensor Heater Control Circuit High Bank 1 Sensor 2 (Ford)
What does P1142 mean?
The P1142 code means the vehicle's onboard diagnostic system has detected: Heated Oxygen Sensor Heater Control Circuit High Bank 1 Sensor 2 (Ford). This is a low severity code.
Common Symptoms
- Check Engine Light on
- Failed emissions inspection
- Slow O2 sensor warm-up
- No significant drivability issues
- Slightly increased cold-start emissions
Probable Causes (Ranked by Likelihood)
- Open O2 sensor heater element Very High
- Open circuit in heater power or ground wire High
- Corroded or disconnected sensor connector Moderate
- Failed heater relay or fuse Moderate
- PCM heater driver open circuit Low
Step-by-Step Diagnostic Procedure
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Measure O2 sensor heater resistance (infinite or very high reading confirms open element)
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Check for power and ground at the sensor connector with key on
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Inspect the heater fuse and relay in the fuse box
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Test wiring continuity from the PCM to the sensor connector
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Replace the O2 sensor if the heater element is open
Frequently Asked Questions
What is the difference between P1141 and P1142?
P1141 indicates a low (short) circuit in the O2 sensor heater, meaning excessive current flow. P1142 indicates a high (open) circuit, meaning no current flow. P1142 is more common and usually means the heater element has burned out.
Will P1142 cause a no-start condition?
No. The O2 sensor heater has no effect on engine starting. The engine will start and run normally. The only impact is that the O2 sensor takes longer to reach operating temperature during warm-up.
How much does an O2 sensor cost for a Ford?
Downstream O2 sensors for Ford vehicles typically cost $40 to $120 for the part. With labor, expect to pay $80 to $300 total. OEM sensors tend to be more expensive but often last longer.