What is engine code P1506 on a 1997 Mazda 626?

Unfortunately, the engine code P1506 is not a standard OBD-II code. There isn't a universal database for this code, and it's likely specific to the 1997 Mazda 626.

Here's why you're having trouble finding information:

* OBD-II Standardization: The 1997 Mazda 626 likely predates the widespread adoption of the standardized OBD-II diagnostic system. Earlier vehicles might have used proprietary codes.

* Specific to the Model: The code could be unique to that particular model year and engine.

Here's what you can do to get the information you need:

1. Consult your Mazda 626's repair manual: This should have a section listing diagnostic trouble codes and their meanings for your specific vehicle.

2. Use a code reader: A more advanced code reader that's compatible with older vehicles might provide more detailed information about the code.

3. Contact a Mazda mechanic or dealership: They can access diagnostic tools and resources that can help identify the problem.

4. Search online forums and communities: Look for forums dedicated to the 1997 Mazda 626 or similar vehicles. Other owners might have encountered the same code and shared their solutions.

Important Note: Be aware that diagnosing and fixing engine problems can be complex. If you're not comfortable working on your vehicle, it's best to take it to a qualified mechanic.