P1133 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code
1. What does the OBDII code P1133 mean on a 2016 Chevrolet Silverado?
P1133 indicates "HO2S Insufficient Switching Bank 1 Sensor 1," meaning the upstream oxygen sensor (Bank 1, Sensor 1) is not switching between rich and lean correctly.
2. What are the common symptoms of code P1133 in a 2016 Chevrolet Silverado?
Symptoms may include poor fuel economy, rough idling, hesitation during acceleration, decreased engine performance, and an illuminated check engine light.
3. What causes the P1133 code on a 2016 Chevrolet Silverado?
Common causes include a failing oxygen sensor, exhaust leaks near the sensor, wiring issues, or engine conditions such as incorrect air-fuel mixture or carbon buildup.
4. How do I diagnose the P1133 code on my 2016 Chevrolet Silverado?
Start by visually inspecting the oxygen sensor and its wiring for damage. Use a scan tool to monitor live data from the sensor and check for proper switching activity between rich and lean.
5. Can a dirty or clogged air filter trigger the P1133 code?
Yes, a dirty air filter can affect the engine’s air-fuel ratio, potentially causing insufficient oxygen sensor switching.
6. Should I replace the oxygen sensor if I get the P1133 code?
Replacing the oxygen sensor may resolve the issue, but it's important to confirm the sensor is faulty by diagnosing the cause of the insufficient switching first.
7. Can an exhaust leak cause the P1133 code on a 2016 Chevrolet Silverado?
Yes, an exhaust leak near Bank 1 Sensor 1 can introduce extra oxygen into the exhaust, causing inaccurate readings and triggering the code.
8. Is it safe to drive with the P1133 code on my 2016 Chevrolet Silverado?
While the vehicle may still be drivable, ignoring the P1133 code can lead to worsened engine performance, reduced fuel efficiency, and potential damage over time.
9. How much does it cost to fix the P1133 code on a 2016 Chevrolet Silverado?
Repair costs vary depending on the cause, with oxygen sensor replacement costing $100–$300, and exhaust or wiring repairs potentially costing more.
10. What preventative measures can help avoid the P1133 code in the future?
Regular maintenance, such as replacing the air filter, checking for exhaust leaks, and using high-quality fuel, can help prevent oxygen sensor issues and the P1133 code.
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