P0416
PPowertrainSecondary Air Switching Valve B Circuit Open
What does this code mean?
Severity : LowP0416 reports an open circuit on the secondary air injection system switching valve B. This system sends air into the exhaust during a cold start so the catalytic converter warms up faster. The module no longer detects valve B when it tries to command it.
Symptoms
- Check engine light on.
- No driveability symptoms in most cases.
- Higher cold start emissions.
- Possible emissions test failure.
Possible causes
- Open switching valve B coil.
- Broken wire in the harness.
- Unplugged or corroded connector.
- Faulty supply fuse or relay.
Diagnosis and repair
- Check the secondary air system fuse and relay.
- Inspect valve B connector and wiring.
- Measure valve resistance and circuit continuity with a multimeter.
- Replace the valve or repair the wiring.
- Clear the code and verify on the next cold start.
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Code
P0416
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012