Secondary Air Injection System Switching Valve B Circuit Shorted
The P0417 code means the vehicle's onboard diagnostic system has detected: Secondary Air Injection System Switching Valve B Circuit Shorted. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $300 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- No drivability symptoms
- Possible blown fuse
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Short to ground in switching valve B wiring Very High
- Internally shorted switching valve B solenoid High
- Water intrusion into valve B connector Moderate
- Damaged wiring harness contacting ground Moderate
Frequently Asked Questions
Can I drive with code P0417?
Yes. This circuit fault only affects the secondary air system during cold starts. Repair is needed for emissions compliance only.
Can water cause P0417?
Yes. The switching valve is often located in the engine bay where it is exposed to rain and road spray. Water entering the connector is a common cause of short circuits.
Should I replace the wiring or the valve?
Test the solenoid resistance first. If the solenoid is internally shorted, replace the valve. If the wiring is damaged, repair or replace the wiring harness section.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Inspect switching valve B wiring for damaged insulation or bare wires
-
Measure solenoid resistance -- very low readings indicate internal short
-
Check the connector for water damage and corrosion
-
With the solenoid disconnected, check the control wire for short to ground
-
Replace the switching valve B if internally shorted
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2002-2013 BMW 550i
- 2004-2016 Audi S4
- 2003-2015 Porsche Cayenne
- 2005-2017 Volkswagen Touareg
- 2006-2018 Subaru Outback
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