HomeEmission Control > SensorsSpectra OS5307 Oxygen Sensor - Downstream or Downstream Left
Part #: OS5307

Spectra OS5307 Oxygen Sensor - Downstream or Downstream Left

Downstream
⚙️ 9 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Mazda, Protege, Protege5, and MPV
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Reliable Oxygen Sensor for Mazda MPV, Protege, and Protege5

The Spectra OS5307 oxygen sensor is designed to provide accurate emissions monitoring for select Mazda vehicles. Engineered to meet OEM specifications, this sensor supports efficient engine performance and emission control for Mazda MPV, Protege, and Protege5 models.

  • Compatible with Mazda MPV, Protege, and Protege5 models
  • Part number OS5307 ensures precise fit and function
  • Monitors oxygen levels in exhaust gases for optimal engine tuning
  • Supports emission control system compliance
  • Durable construction for long service life

Product Details and Functionality

The Spectra OS5307 oxygen sensor plays a critical role in the emission control system by measuring the oxygen content in the exhaust stream. This data is used by the engine control unit (ECU) to adjust the air-fuel mixture, improving fuel efficiency and reducing harmful emissions. Designed specifically for Mazda MPV, Protege, and Protege5 vehicles, this sensor ensures compatibility and reliable operation. The part number OS5307 corresponds to a direct replacement sensor that meets or exceeds original equipment standards.

Common Applications and Issues Addressed

  • Helps resolve rough idling and engine hesitation
  • Reduces excessive fuel consumption caused by incorrect air-fuel ratios
  • Prevents failed emissions tests due to faulty sensor readings
  • Eliminates check engine light triggers related to oxygen sensor faults
  • Supports smooth engine performance and reduced exhaust emissions

Installation Notes and Tips

  • Ensure vehicle compatibility with Mazda MPV, Protege, or Protege5 before installation
  • Disconnect the battery before sensor replacement to avoid electrical issues
  • Use appropriate tools to avoid damaging the sensor or exhaust components
  • Apply anti-seize compound on sensor threads if recommended by manufacturer
  • Verify sensor wiring connections are secure and free of corrosion

Quality Assurance and Warranty

The Spectra OS5307 oxygen sensor is manufactured to meet strict quality standards for emission control components. While specific warranty details may vary, Spectra typically offers coverage against defects in materials and workmanship. This ensures dependable performance and peace of mind when replacing the oxygen sensor on your Mazda MPV, Protege, or Protege5.

This part fits 9 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2003MazdaProtege2.0LL4Downstream
2003MazdaProtege52.0LL4Downstream
2002MazdaProtege2.0LL4Downstream
2002MazdaProtege52.0LL4Downstream
2001MazdaMPV2.5LV6Downstream LeftCalifornia emissions vehicles only.
2001MazdaProtege2.0LL4Downstream
2000MazdaMPV2.5LV6Downstream LeftCalifornia emissions vehicles only.
2000MazdaProtege1.8LL4Downstream
1999MazdaProtege1.8LL4Downstream

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

138681526721330792251423447525S3611752400752523ES10739ES20123FP5018861FP5018861AFP5018861A9UFP5018861ACAFSAX18861FSAX188619UGY0218861GY0218861BGY0218861B9UGY0218861BCAOS1836OS1919SG1082SG1082TSG1165SG1165TSU5249

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.