P1130 on Toyota: How to Diagnose & Fix
Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction, Bank 1 Sensor 1
1 Toyota model · 1 documented issue · $120-$400 repair
P1130 on Toyota by model: symptoms, diagnosis and fix
Later 3rd-gen and 4th-gen 4Runners use a wide-band Air-Fuel Ratio (A/F) sensor as the upstream (Bank 1 Sensor 1) oxygen sensor. With age and heat cycling the sensor's internal heater or element degrades, setting codes such as P0125 (insufficient coolant temp for closed loop / A-F feedback), P1130 (A-F sensor range/performance), or P0135 (heater circuit). Symptoms include poor fuel economy, hesitation, and a check engine light. It's a very common high-mileage sensor replacement and a frequent search topic.
Common Symptoms
- Check engine light P0125, P1130, or P0135
- Reduced fuel economy
- Hesitation or slight rough running
- Long time to reach closed loop when cold
- Failed emissions readiness monitor
How to Fix
Confirm with live data (A/F sensor slow to respond, or heater resistance out of range) and check the sensor connector/harness for corrosion before condemning the sensor. Replace with a genuine Denso/Toyota A/F sensor — aftermarket units frequently cause repeat faults on Toyota's sensitive A/F circuit. For the 4th-gen 4.0L, the upstream Bank 1 A/F sensor is Toyota 89467-series (e.g., Denso 234-9055 / Toyota 89467-60010); verify the exact part against your year/engine. Parts $120-350; DIY-friendly with an O2 socket.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Toyota 89467-35011 front air-fuel ratio sensor
2000-2002 5VZ-FE Bank 1 upstream branch after circuit and live-data diagnosis Fitment/availability: 1998-2002 Toyota 4Runner including 3.4L 5VZ-FE; catalog Q&A specifically identifies this part for 2000 4Runner upstream Bank 1 and it sup…
- Genuine Toyota 89467-60010 air-fuel ratio sensor
early fourth-generation upstream branch after bank-specific heater/performance diagnosis Fitment/availability: 2003-2005 Toyota 4Runner 4.0L 1GR-FE and 4.7L 2UZ-FE; catalog shows quantity two, so confirm the failed bank and VIN before or…
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Sources for this issue (2)
P1130 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1130 mean on a Toyota?
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 Toyota it is documented across 1 model: 4Runner.
What are the most common causes of P1130?
The most common causes of P1130 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P1130 on a Toyota?
Published repair estimates on Toyota range from $120 to $400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1130 on a different make?
View P1130 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.