Mazda Error Code P1195: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
Error Code
P1195
Brand
Mazda
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Mazda error code P1195 indicates a problem with the EGR (Exhaust Gas Recirculation) boost sensor circuit. This sensor monitors the pressure differential across the EGR valve to ensure proper exhaust gas recirculation, and when it malfunctions, it can cause poor engine performance and increased emissions.
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Tools You'll Need

How to Fix Error Code P1195

  1. Connect OBD2 Scanner and Confirm Code

    Ensure the engine is completely cool before beginning any diagnostic work.
  2. Visually Inspect EGR System Components

    Engine may be hot - allow sufficient cooling time and avoid touching hot surfaces.
  3. Test EGR Boost Sensor Electrical Connection

  4. Check Vacuum Lines and EGR Valve Operation

  5. Test EGR Boost Sensor Function

    Keep hands and tools clear of moving engine parts while testing.
  6. Replace Faulty Components

    Always disconnect the battery before replacing electrical components to prevent shorts or damage.
  7. Clear Codes and Test Drive

Parts You May Need

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When to Call a Professional

Call a professional mechanic if you're uncomfortable working with electrical systems, if multiple related codes appear simultaneously, or if the problem persists after replacing obvious faulty components. Complex EGR system issues may require specialized diagnostic equipment and technical knowledge.

Frequently Asked Questions

Can I drive my Mazda with P1195 error code?
You can drive short distances, but the vehicle may experience reduced performance, poor fuel economy, and increased emissions. It's best to diagnose and fix the issue promptly to prevent potential damage to other engine components.
How much does it cost to fix Mazda P1195 error code?
Repair costs typically range from $100-400 depending on the root cause. A simple vacuum hose replacement costs around $20-50, while an EGR boost sensor replacement typically costs $150-300 including parts and labor.
What causes Mazda P1195 EGR boost sensor circuit error?
Common causes include a faulty EGR boost sensor, damaged vacuum hoses, corroded electrical connections, a stuck EGR valve, or carbon buildup in the EGR system preventing proper operation.
Will P1195 error code cause my Mazda to fail emissions testing?
Yes, P1195 will likely cause your vehicle to fail emissions testing since it indicates an EGR system malfunction. The EGR system is crucial for controlling NOx emissions, and any related error codes must be resolved before passing inspection.
How do I prevent P1195 error code from returning?
Regular maintenance including cleaning the EGR system, replacing vacuum hoses when cracked, and using quality fuel with occasional injector cleaner can help prevent EGR-related issues. Follow your Mazda's recommended maintenance schedule for best results.