16517/P0133/000307: Difference between revisions
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Table Of Contents
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1.
P0133 - Oxygen (Lambda) Sensor B1 S1
- 1.2.1 Possible Symptoms
- 1.3.1 Possible Causes
- 1.4.1 Monitoring Conditions
- 1.5.1 Possible Solutions
- 1.6.1 Special Notes
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== | == P0133 - Oxygen (Lambda) Sensor B1 S1 == | ||
=== P0133 - Oxygen (Lambda) Sensor B1 S1: Response too Slow === | |||
== Possible Symptoms == | === Possible Symptoms === | ||
* MIL (Malfunction Indicator Lamp) ON | * MIL (Malfunction Indicator Lamp) ON | ||
* Poor fuel economy | * Poor fuel economy | ||
| Line 10: | Line 11: | ||
== Possible Causes == | === Possible Causes === | ||
* Aged, contaminated, or faulty Oxygen Sensor 1 Before Catalytic Converter -GX10- (Bank 1 Sensor 1) | * Aged, contaminated, or faulty Oxygen Sensor 1 Before Catalytic Converter -GX10- (Bank 1 Sensor 1) | ||
* Exhaust leak ahead of the front oxygen sensor | * Exhaust leak ahead of the front oxygen sensor | ||
| Line 20: | Line 21: | ||
== Monitoring Conditions == | === Monitoring Conditions === | ||
* Monitor Strategy: Front O2 signal dynamic check | * Monitor Strategy: Front O2 signal dynamic check | ||
* Malfunction Criteria: | * Malfunction Criteria: | ||
| Line 28: | Line 29: | ||
== Possible Solutions == | === Possible Solutions === | ||
* Address any related DTCs first (misfire, fuel trim, MAF, exhaust leaks) | * Address any related DTCs first (misfire, fuel trim, MAF, exhaust leaks) | ||
* Inspect wiring, grounds, and connectors for Oxygen Sensor 1 Before Catalytic Converter | * Inspect wiring, grounds, and connectors for Oxygen Sensor 1 Before Catalytic Converter | ||
| Line 42: | Line 43: | ||
== Special Notes == | === Special Notes === | ||
* We always recommend to use original equipment replacement parts, not all sensors are created equally. | * We always recommend to use original equipment replacement parts, not all sensors are created equally. | ||
* After replacement, clear DTCs and road test to confirm repair. | * After replacement, clear DTCs and road test to confirm repair. | ||
Latest revision as of 18:47, 18 September 2025
P0133 - Oxygen (Lambda) Sensor B1 S1
P0133 - Oxygen (Lambda) Sensor B1 S1: Response too Slow
Possible Symptoms
- MIL (Malfunction Indicator Lamp) ON
- Poor fuel economy
- Increased emissions or failed inspection
- DTC stored in ECM
Possible Causes
- Aged, contaminated, or faulty Oxygen Sensor 1 Before Catalytic Converter -GX10- (Bank 1 Sensor 1)
- Exhaust leak ahead of the front oxygen sensor
- Wiring or connector faults at the front oxygen sensor or its heater circuit
- Air leaks or unmetered air (intake vacuum leaks, PCV issues)
- Fuel delivery or mixture control issues affecting lambda dynamics (fuel pressure, MAF faults)
- Sensor contaminated by silicone, coolant, or leaded additives
- ECM software calibration issues (in rare cases)
Monitoring Conditions
- Monitor Strategy: Front O2 signal dynamic check
- Malfunction Criteria:
- Delayed response
- Slow transition
- Delayed response while avoiding controller oscillations
Possible Solutions
- Address any related DTCs first (misfire, fuel trim, MAF, exhaust leaks)
- Inspect wiring, grounds, and connectors for Oxygen Sensor 1 Before Catalytic Converter
- Verify heater circuit operation for the front oxygen sensor
- Inspect exhaust system for leaks ahead of B1 S1
- Check fuel trims and correct intake leaks or MAF faults
- See: Fuel Trim Info
- Evaluate sensor switching speed with scan data or scope
- Induce lean and rich conditions and confirm lean↔rich transition times meet thresholds
- (verify exact test procedure and thresholds with Official Factory Repair Information)
- Induce lean and rich conditions and confirm lean↔rich transition times meet thresholds
- Replace the front oxygen sensor if slow response is confirmed
- Perform any required basic settings or adaptation resets after repairs per Official Factory Repair Information
Special Notes
- We always recommend to use original equipment replacement parts, not all sensors are created equally.
- After replacement, clear DTCs and road test to confirm repair.
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