What does code P1128 mean on Jaguar vehicles?
The ECU detects malfunctions in the upstream heated oxygen sensors on both banks.
OBD-II Code Jaguar
P1128 — Jaguar — Heated Oxygen Sensors Upstream Bank 1 and Bank 2 Malfunction
The ECU detects malfunctions in the upstream heated oxygen sensors on both banks.
Common symptoms
- Increased fuel consumption
Possible causes
- Aged or faulty upstream oxygen sensors
Initial recommendation
Perform oxygen sensor diagnostics and replace affected sensors.
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
Use the app to combine Jaguar code P1128 with your vehicle's actual symptoms for more complete diagnostic guidance.
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