What does it mean?
P1100 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: O2 Sensor Circuit (Bank 1-Sensor 2) Heating Circuit Voltage Too Low .
MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
Severity
Medium
Can I keep driving?
Usually drivable, but get it diagnosed without delay.
First step
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Identify what your manufacturer means by P1100, this is critical and can be checked via a manufacturer-level scan tool or service documentation 2. If oxygen sensor (Audi, Jaguar, Kia): inspect the rear sensor and its heater circuit, swap if the heater is open 3. If MAF (BMW, Ford): clean the MAF, inspect the connector 4. If MAP (Hyundai): check the sensor's vacuum source and signal wire 5. Generic code readers may show 'unknown manufacturer code' for P1100, consult the make's wiring diagrams or a marque specialist
- PPowertrain
- 1Manufacturer-specific
- 1Powertrain (Other)
- 00Sequence number
Codes From the Same System
All Fault Codes- P0E00Generator Phase U Current Sensor Circuit
- P0E01Generator Phase U Current Sensor Circuit Range/Performance
- P0E02Generator Phase U Current Sensor Circuit Low
- P0E03Generator Phase U Current Sensor Circuit High
- P0E04Generator Phase V Current Sensor Circuit
- P0E05Generator Phase V Current Sensor Circuit Range/Performance
- P0E06Generator Phase V Current Sensor Circuit Low
- P0E07Generator Phase V Current Sensor Circuit High
Related Similar Codes
- P1101MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted
- P1102MAF Sensor In Range But Lower Than Expected
- P1103MAF Sensor In Range But Higher Than Expected
- P1104MAF Sensor Intermittent/ Check of all OBDII Systems Not Complete
- P1105Dual Alternator Upper Fault
- P1106Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
- P1107Dual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
- P1108Dual Alternator Battery Lamp Circuit Malfunction
This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.