A P0418 code on your 2022 Mazda CX-5 indicates a malfunction in the secondary air injection relay or solenoid circuit specifically for bank 1. This bank-specific code helps isolate problems on engines with dual-bank SAI systems.
Bank-Specific SAI Systems
On V-configuration engines or systems with separate air injection for each exhaust manifold, bank 1 refers to the side containing cylinder 1. Each bank may have its own control solenoid or relay, allowing independent operation and fault identification.
CX-5 Engine Configuration
The 2022 CX-5 uses inline four-cylinder Skyactiv engines (2.0L or 2.5L). Inline engines typically have a single exhaust manifold, making 'bank 1' designation unusual. Verify whether your CX-5 actually has a SAI system and its configuration.
If SAI System Exists
P0418 indicates electrical problems with the relay or solenoid controlling bank 1 air injection. The relay may have failed, wiring may be damaged, or the control solenoid in the air valve may have a circuit fault. Since it's bank-specific, bank 2 (if present) would still function.
Diagnostic Steps
Confirm SAI system presence on your specific CX-5. Use Mazda M-MDS to identify the specific circuit. Test the relay for proper operation. Check solenoid resistance. Verify wiring integrity for the bank 1 circuit. Compare to bank 2 operation if applicable.