P0416: AIR System Switching Valve B Circuit Open
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes.
Symptoms
- Check engine light
- Emissions test failure
- Occasional cold-start roughness
Likely causes, most common first
- Open circuit in the B valve control
- Solenoid failed
- Harness damage
- Fuse or relay
Read P0416 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0416 is the open-circuit fault for the second switching valve, on systems that split secondary air delivery between banks or stages. It appears mostly on V engines, where each bank gets its own valve.
When only one bank's valve faults, comparing the two sides is the shortcut nature provides: same part, same age, one working. Swap the connectors or the valves and watch whether the code follows. Symmetry is the cheapest diagnostic tool a V engine offers, and it applies here exactly as it does to coils and sensors.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0416
“Code p1410 secondary air injection system switching valve stuck open. This is a common error many 2006 and up subaru impreza wrx owners are having. The emissions system is prone to fail due to carbon buildup or moisture and rust contaminating valves, leading to repairs costing $700 to $1500. This failure is common even with low mileage. Note these codes are also associated with this failure: 06/07 wrx: p0410 p0411 p0413 p0414 p0416 p0417 p0418 p2431 p2432 p2433 p2440 p2441 p2442 p2443 p2444 07 sti: p0410 p0411 p0413 p0414 p0418 p2431 p2432 p2433 p2441 p2444 *tr”2006 Subaru WRX · Jan 2012 · 66,870 mi
“Code p1410 secondary air injection system switching valve stuck open. This is a common error many 2006 and up subaru impreza wrx owners are having. The emissions system is prone to fail due to carbon buildup or moisture and rust contaminating valves, leading to repairs costing $700 to $1500. This failure is common even with low mileage. Note these codes are also associated with this failure: 06/07 wrx: p0410 p0411 p0413 p0414 p0416 p0417 p0418 p2431 p2432 p2433 p2440 p2441 p2442 p2443 p2444 07 sti: p0410 p0411 p0413 p0414 p0418 p2431 p2432 p2433 p2441 p2444. *tr”2006 Subaru Impreza · Apr 2011 · 60,000 mi
Cars that report P0416 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0416?
Yes.
How much does it cost to fix P0416?
Typical US repair costs range from $20 for the simplest fix (fuse or relay) to $400 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0416. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.