TSBs

Replacing Mazda6 exhaust manifold

April 22, 2025

This bulletin applies to 2017-2020 Mazda6 vehicles produced before July 8, 2020, 2019-2020 CX-5 vehicles built before July 7, 2020, and 2016-2020 CX-9 vehicles built before July 8, 2020 (all equipped with a 2.5L engine).

Mike Mavrigian

Related To:

Mitchell 1

Replace the exhaust manifold with P/N PY8V-13-450K. You’ll also need manifold gasket PY8V-13-460C, six manifold nuts P/N SH01-13-465, turbo gasket PY8V-13-710B, gasket PY88-13-490, five exhaust manifold nuts PY88-13-465A, gasket PE23-40-305 and two nuts 9994-61-000.

Some customers may experience a squeaking noise heard from the exhaust manifold when the idle speed drops from fast idle to normal idle speed during a cold start. This is caused by a variable valve being stuck in the closed position. When returning from fast to normal idle, the stuck valve suddenly opens due to thermal change around it, which causes the abnormal noise.

To eliminate the concern, the internal design of the exhaust manifold has been modified.

Replace the exhaust manifold with P/N PY8V-13-450K. You’ll also need manifold gasket PY8V-13-460C, six manifold nuts P/N SH01-13-465, turbo gasket PY8V-13-710B, gasket PY88-13-490, five exhaust manifold nuts PY88-13-465A, gasket PE23-40-305 and two nuts 9994-61-000.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.