P1130 on Audi
Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1
P1130 on Audi vehicles indicates air/fuel ratio sensor circuit range/performance malfunction, bank 1 sensor 1. Au7o has documented this code across 2 Audi models — most commonly on Q5, SQ5. A Toyota/Lexus manufacturer-specific code. The engine control module has decided the upstream air/fuel ratio sensor (the wideband oxygen sensor ahead of the catalytic converter on the cylinder bank containing cylinder #1) is reporting a signal that does not make sense for current operating conditions. Because the ECM leans on this sensor to trim the fuel mixture, the car may idle rough, hesitate, and burn more fuel. Note that other manufacturers use P1130 for unrelated faults - Ford defines it as "Lack of HO2S Switch - Adaptive Fuel at Limit" (Bank 1), so the vehicle make matters here.
Common Causes of P1130
- •Failed air/fuel ratio sensor, Bank 1 Sensor 1
- •Blown A/F sensor heater fuse or failed heater element
- •Damaged, melted, or chafed sensor wiring near the exhaust
- •Corroded or loose sensor connector
- •Exhaust or intake air leak upstream of the sensor skewing its reading
- •Fuel delivery or injector fault pushing the mixture outside the sensor's expected range
- •Failed ECM (rare - verify everything else first)
P1130 on Audi by Model
Audi Q5(1 issue)
- 2009-2025 Q5 Gasoline-Quality Deposit Diagnosis - TSB 2014753/132009-2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits on intake valves, the intake manifold, fuel injectors and combustion chambers. Possible results include rough running after cold start, extended cranking, hesitation, rough idle, reduced performance, poor fuel economy or an MIL with misfire, lean-system or air/fuel-ratio-imbalance faults. This does not establish a universal Q5 intake-valve defect, a mandatory walnut-blasting interval or a fixed failure mileage.
Audi SQ5(1 issue)
- Fuel-Quality or Deposit-Related Rough Running and Misfire Diagnosis2014-2025
Audi states that contaminated gasoline or gasoline with insufficient deposit-control additives can contribute to deposits in injectors, combustion chambers, the intake manifold and intake valves, with rough running, hesitation, reduced performance, poor fuel economy or related ECM faults. This does not establish a universal SQ5 intake-valve defect, a mandatory walnut-blasting interval or a fixed mileage. Audi separately warns that unapproved fuel additives are not permitted on 2018-2025 EA839 V6 TFSI SQ5 models because a negative effect on engine life cannot be ruled out.
Looking for P1130 on a different make?
View P1130 across all makes →Frequently Asked Questions
What does P1130 mean on Audi?▼
P1130 stands for "Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1." A Toyota/Lexus manufacturer-specific code. The engine control module has decided the upstream air/fuel ratio sensor (the wideband oxygen sensor ahead of the catalytic converter on the cylinder bank containing cylinder #1) is reporting a signal that does not make sense for current operating conditions. Because the ECM leans on this sensor to trim the fuel mixture, the car may idle rough, hesitate, and burn more fuel. Note that other manufacturers use P1130 for unrelated faults - Ford defines it as "Lack of HO2S Switch - Adaptive Fuel at Limit" (Bank 1), so the vehicle make matters here. On Audi specifically, this code is documented across 2 models.
What causes P1130 on Audi vehicles?▼
Common causes on Audi: Failed air/fuel ratio sensor, Bank 1 Sensor 1, Blown A/F sensor heater fuse or failed heater element, Damaged, melted, or chafed sensor wiring near the exhaust, Corroded or loose sensor connector, Exhaust or intake air leak upstream of the sensor skewing its reading. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1130 on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P1130 documented?▼
Au7o has documented P1130 on 2 Audi models: Q5, SQ5.