P1133 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code
What does the OBDII code P1133 mean on a 2018 Chevrolet Silverado?
The P1133 code indicates that the upstream oxygen sensor (Bank 1, Sensor 1) is not switching between rich and lean as expected, suggesting insufficient activity.
What are common symptoms of the P1133 code in a 2018 Chevrolet Silverado?
Common symptoms include a check engine light, possible rough idling, decreased fuel efficiency, and sometimes poor engine performance.
What causes the P1133 code on a 2018 Chevrolet Silverado?
The main causes include a faulty oxygen sensor, wiring or connector issues, exhaust leaks near the sensor, or engine performance problems affecting air-fuel mixture.
Can a dirty or faulty air filter cause the P1133 code?
Yes, a clogged air filter can affect the air-fuel mixture, potentially leading to a P1133 code if the oxygen sensor cannot properly monitor switching activity.
How do you diagnose the P1133 code on a 2018 Chevrolet Silverado?
Diagnosis involves checking the oxygen sensor's operation with a scan tool, inspecting wiring and connectors for damage, and checking for exhaust leaks or engine performance issues.
Is it safe to drive a 2018 Chevrolet Silverado with the P1133 code?
While the vehicle may still be drivable, prolonged driving with this code can lead to decreased fuel efficiency and potential damage to the catalytic converter, so repairs should be made promptly.
How do you fix the P1133 code on a 2018 Chevrolet Silverado?
Repairs may involve replacing the upstream oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing engine issues affecting the air-fuel ratio.
Can bad fuel cause the P1133 code on a 2018 Chevrolet Silverado?
Poor-quality fuel can affect combustion and air-fuel mixture, possibly contributing to the P1133 code, though it’s not the most common cause.
How much does it typically cost to fix the P1133 code on a 2018 Chevrolet Silverado?
Repair costs can range from $150 to $300, depending on whether the oxygen sensor needs replacement or other issues like wiring or exhaust leaks are involved.
Will clearing the P1133 code fix the problem permanently?
Clearing the code may turn off the check engine light temporarily, but the issue will likely return unless the underlying problem is properly addressed.
Discuss the causes and fixes for P1133 2018 Chevrolet Silverado OBDII Code
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