What does code P1128 mean on Ford vehicles?
The PCM detects reversed oxygen sensor signals.
OBD-II Code Ford
P1128 — Ford — O2 Sensor Signals Reversed
The PCM detects reversed oxygen sensor signals.
Common symptoms
- Incorrect air-fuel mixture
- reduced performance
Possible causes
- Incorrect wiring
- wrong O2 sensor installed
Initial recommendation
Verify O2 sensor installation and wiring routing.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
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