P1133 2017 Chevrolet Silverado Code - HO2S Insufficient Switching Bank 1 Sensor 1
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1133 2017 Chevrolet Silverado indicates HO2S Insufficient Switching Bank 1 Sensor 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1133 2017 Chevrolet Silverado Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor rich-to-lean counts or the lean-to-rich counts are less than a calibrated value greater than 100s.
What are the Possible Causes of the DTC P1133 2017 Chevrolet Silverado?
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P1133 2017 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1133 2017 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1133 2017 Chevrolet Silverado Code
What does OBDII code P1133 mean on a 2017 Chevrolet Silverado?
P1133 indicates "HO2S Insufficient Switching Bank 1 Sensor 1," meaning the oxygen sensor upstream of the catalytic converter on Bank 1 is not switching between rich and lean as expected.
What are the common symptoms of code P1133 in a 2017 Chevrolet Silverado?
Symptoms may include an illuminated check engine light, decreased fuel efficiency, rough idling, poor engine performance, or failed emissions testing.
What causes code P1133 to appear in a 2017 Chevrolet Silverado?
Common causes include a faulty oxygen sensor, wiring issues (such as damaged or corroded connections), exhaust leaks near the sensor, or a problem with the engine's air-fuel mixture.
Can I drive my 2017 Chevrolet Silverado with code P1133?
While the truck may still be drivable, continuing to drive with this code can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter if the issue is not addressed.
How do I fix code P1133 on a 2017 Chevrolet Silverado?
Repairs may involve replacing the upstream oxygen sensor (Bank 1 Sensor 1), repairing any damaged wiring or connectors, fixing exhaust leaks, or addressing fuel system issues.
How can I diagnose the cause of code P1133 in my 2017 Chevrolet Silverado?
Start by checking for exhaust leaks near the sensor, inspecting the sensor's wiring and connections, and testing the oxygen sensor's functionality with a multimeter or scan tool.
Is replacing the oxygen sensor the only solution for code P1133?
Not necessarily. While a faulty oxygen sensor is a common cause, the issue could also stem from wiring problems, exhaust leaks, or an incorrect air-fuel mixture, which should be diagnosed first.
How much does it cost to fix code P1133 on a 2017 Chevrolet Silverado?
Costs vary but replacing an oxygen sensor generally costs $100–$300, including parts and labor. Additional repairs for wiring or exhaust issues may increase the total cost.
Can a dirty air filter cause code P1133 in a 2017 Chevrolet Silverado?
A dirty air filter can indirectly contribute to an incorrect air-fuel mixture, which might lead to oxygen sensor issues and trigger the P1133 code.
Will clearing the P1133 code with a scan tool fix the problem?
Clearing the code will turn off the check engine light temporarily, but it won’t resolve the underlying issue. The code is likely to return if the problem isn’t properly repaired.
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