P0419
Fix within a few daysSecondary Air Injection System Relay 'B' Circuit Malfunction
Code P0419 means there's an electrical problem with your secondary air injection system relay. Common causes: Faulty SAI relay (60%), wiring issues (20%), blown fuse (10%). Drivability: Yes, safe to drive. Repair cost: $10-$50 DIY, $100-$250 professional.
Can I Drive With P0419?
Yes, safe to drive
No restrictions
Stop driving immediately if: No direct stop-driving conditions for this code.
Symptoms of P0419
- 1Check Engine Light is on
- 2Failed emissions/smog test
Common Causes of P0419
Parts most likely causing this code, ranked by probability
The relay itself can fail internally, preventing the secondary air pump from receiving power.
60% of P0419 cases are fixed by replacing this part
Corroded, loose, or damaged wiring or connectors in the relay circuit can interrupt the electrical signal.
20% of P0419 cases are fixed by repairing this part
A short in the secondary air injection system can blow the fuse, cutting power to the relay circuit.
10% of P0419 cases are fixed by replacing this part
An internal short or excessive current draw in the pump motor can overload and damage the relay or blow its fuse.
5% of P0419 cases are fixed by replacing this part
A rare fault in the PCM's driver circuit for the SAI relay can cause this code.
5% of P0419 cases are fixed by replacing this part
Check These First (Before Buying Parts)
- Locate the fuse for the secondary air injection system (check your owner's manual) and visually inspect it. Replace if blown.
- Locate the secondary air injection relay (often in the underhood fuse box) and visually inspect its connector for corrosion or loose wires.
How to Diagnose P0419
- 1Locate the secondary air injection system fuse and check for continuity. Replace if blown.
- 2Locate the secondary air injection system relay and inspect its connector for corrosion or damage.
- 3Swap the SAI relay with a known good, identical relay from another circuit (e.g., horn relay) to test its function.
- 4Using a multimeter, check for proper voltage and ground at the relay socket terminals.
- 5Test the continuity of the wiring between the relay socket and the SAI pump, and between the relay socket and the PCM.
- 6If the relay, fuse, and wiring are good, test the SAI pump for proper operation by applying direct power and ground.
P0419 on Popular Vehicles
Ford F-150
2004-2024Ford F-150s are known for secondary air injection system issues, especially in colder climates. The SAI pump and its relay are common failure points. Always check the fuse and relay first.
70% fixed by replacing the relay or fuse
Chevrolet Silverado
2007-2024Similar to Ford trucks, Chevrolet Silverados can experience P0419 due to a failing SAI pump relay or a blown fuse. The SAI pump itself should also be inspected if the relay and fuse are good.
65% fixed by replacing the relay or repairing wiring
Toyota Camry
2007-2024While less common on Toyota Camry models, P0419 typically indicates a faulty SAI pump relay or a wiring issue. Check the relay and its connections thoroughly before suspecting the pump.
75% fixed by replacing the relay or repairing wiring
Frequently Asked Questions
What does P0419 mean?
P0419 indicates an electrical malfunction in the circuit for the secondary air injection system's 'B' relay. This relay controls the secondary air pump, which helps reduce emissions during cold starts.
Can I drive with P0419?
Yes, safe to drive. P0419 does not directly affect your engine's performance or drivability. Your vehicle will still run normally, but its emissions system will not be functioning correctly.
Will P0419 clear itself?
No, P0419 will not clear itself. The Check Engine Light will remain on until the underlying electrical issue with the secondary air injection relay circuit is diagnosed and repaired.
How do I fix P0419 myself?
Start by checking the fuse for the secondary air injection system. If the fuse is good, locate the SAI relay (often in the underhood fuse box) and inspect its connector. You can try swapping it with an identical, known-good relay from another circuit to see if the code clears. If not, you'll need a multimeter to test the wiring and the relay's power supply.
How much does it cost to fix P0419?
If it's just a fuse or the SAI relay, the DIY cost is $10-$50. A professional shop will charge $100-$250 for diagnosis and relay replacement. If the issue is a faulty SAI pump, costs can range from $150-$400 for parts DIY, or $300-$800 professionally.
P0419 keeps coming back - why?
If P0419 keeps returning, it means the root cause wasn't fully addressed. Common reasons include a faulty secondary air pump causing the relay to fail repeatedly, a persistent wiring short, or an intermittent connection that wasn't properly repaired.
Will P0419 fail emissions/smog test?
Yes, P0419 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on, regardless of the code, is an automatic failure in most jurisdictions.
What's the difference between P0419 and P0410?
P0419 specifically points to an electrical circuit malfunction with the 'B' relay for the secondary air injection system. P0410 is a more general code indicating a 'Secondary Air Injection System Malfunction,' which could be the pump, valves, or other components, not just the relay circuit.
P0419 on Ford F-150?
On Ford F-150s, P0419 often points to a faulty secondary air injection pump relay or a blown fuse. The SAI pump itself can also fail, leading to relay issues. Always check the fuse and relay first, as they are the easiest and cheapest fixes.
Questions to Ask Your Mechanic
Did you check the fuse for the secondary air injection system?
Good answer: Yes, the fuse is good, or I replaced a blown fuse and it held.
What did you find when testing the SAI relay and its circuit?
Good answer: I tested the relay and it's faulty, or I found a break in the wiring to the relay, or the relay isn't getting proper power/ground.
Repair Cost Estimate
DIY Repair
Parts only
$10-$50
Shop Repair
Parts + labor
$100-$250
Save $90-$200 by doing it yourself
Difficulty
beginner
Time
0.5-1 hours
Beginner-friendly - replacing a fuse or relay is simple. Intermediate if you need to diagnose wiring with a multimeter.
Cost of Waiting
Ignoring P0419 means your vehicle's emissions system is not working correctly, which will cause you to fail an emissions test. While it doesn't directly harm your engine, a faulty relay can lead to a non-functional secondary air pump, increasing harmful exhaust emissions and potentially causing other SAI components to wear prematurely.
While You're In There...
If accessible, checking or replacing the SAI pump filter can prevent debris from entering the pump, extending its life and preventing future issues.
Tools You'll Need
- Basic hand tools (screwdriver, pliers)
- Multimeter
- Relay puller (optional)
P0419 is a common electrical code related to your emissions system. Most repairs are straightforward, often just a fuse or relay, and your vehicle will pass emissions afterward.
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Your Next Steps
Step 1: Check the secondary air injection system fuse. If it's blown, replace it and see if the code clears. If it blows again, there's a short in the system.
Step 2: If the fuse is good, locate the SAI relay. Try swapping it with an identical, known-good relay from another non-critical circuit (like the horn) to see if the code resolves.
Step 3: If swapping the relay doesn't work, use a multimeter to test for proper voltage and ground at the relay socket. This will help determine if the issue is with the relay itself, the wiring, or the PCM.