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2004 Cadillac CTS P0446 Fault Code: Bosch Spark Plug FGR8KQE0 Replacement Solution

Model: 2004 Cadillac CTS Fault Code: P0446 Posted: 2015-03-11 09:40

I'm experiencing a P0446 diagnostic trouble code on my 2004 Cadillac CTS, which indicates a malfunction in the evaporative emission control system. I have currently installed the Bosch FGR8KQE0 spark plug as part of a troubleshooting effort. While this replacement fits my vehicle and is compatible with the engine specifications, some users report inconsistent performance or compatibility issues with aftermarket brands like Bosch. The P0446 code may be related to sensor readings or fuel system integrity, so it's important to ensure proper installation and correct component selection.

Related fault codes
P0446
Comments (2)
Anonymous 2015-03-11 09:41

The Bosch FGR8KQE0 spark plug I mentioned above is the exact part I'm currently using and it fits my 2004 Cadillac CTS perfectly.

Anonymous 2015-03-11 12:21

Bosch components are not always recommended for this application. The three-electrode design in some Bosch spark plugs does not meet original specifications. For reliable performance and to avoid weak links, it's best to use OEM parts. Addressing the root cause of P0446 with genuine factory components is key to resolving the issue.