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P1420 BMW Code - Secondary Air Valve Control Circuit Electrical

Quick Answer

The P1420 BMW code specifically relates to an issue with the Secondary Air Valve Control Circuit Electrical. Common causes include Faulty secondary air valve, Wiring issues in the electrical circuit, Faulty Engine Control Module (ECM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1420 BMW indicates Secondary Air Valve Control Circuit Electrical.
Common causes
Common causes include Faulty secondary air valve, Wiring issues in the electrical circuit, Faulty Engine Control Module (ECM).
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1420 BMW Description

The P1420 BMW code specifically relates to an issue with the Secondary Air Valve Control Circuit Electrical. The secondary air system is an emissions control system that helps reduce harmful emissions by injecting fresh air into the exhaust system. The secondary air valve controls the flow of air into the exhaust system, and if there is a fault in the electrical circuit controlling this valve, it can lead to a variety of issues.

OBDII Code P1420 BMW - Secondary Air Valve Control Circuit Electrical
P1420 BMW Code - Secondary Air Valve Control Circuit Electrical

Common Causes of P1420 BMW

  1. Faulty secondary air valve
  2. Wiring issues in the electrical circuit
  3. Faulty Engine Control Module (ECM)
  4. Vacuum leaks in the system
  5. Clogged secondary air filter

Symptoms of P1420 BMW

  1. Check Engine Light is illuminated on the dashboard
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Failed emissions test
  5. Engine misfires

How to Fix P1420 BMW

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to read the fault codes and pinpoint the problem area.
  2. Inspect the secondary air valve and the electrical connections for any visible damage or corrosion. Replace the valve if necessary.
  3. Check the wiring harness for any breaks, frays, or loose connections. Repair or replace any damaged wiring.
  4. Inspect the Engine Control Module (ECM) for faults or damage. If necessary, reprogram or replace the ECM.
  5. Clear the fault codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1420 BMW

The cost of repairing a P1420 BMW code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. Overall, you can expect to pay anywhere from $250 to $700 for this repair. Keep in mind that these are rough estimates, and actual costs may vary. It is recommended to contact local auto repair shops for more accurate pricing information.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1420 BMW Code

1. What does the OBDII code P1420 mean on a BMW?

The P1420 code indicates an issue with the Secondary Air Valve Control Circuit, specifically an electrical fault.

2. What are the symptoms of a P1420 code on a BMW?

Common symptoms include an illuminated check engine light, failed emissions tests, and potentially reduced engine performance.

3. What causes the P1420 code on a BMW?

Possible causes include a faulty secondary air valve, damaged wiring or connectors, a failed relay, or a malfunctioning secondary air pump.

4. Can a P1420 code cause drivability issues?

While it might not directly affect drivability, it can lead to increased emissions and may trigger limp mode in some cases.

5. How is the P1420 code diagnosed on a BMW?

Diagnosis involves checking the secondary air valve, testing the control circuit for proper voltage, and inspecting wiring and connectors for damage.

6. Can I drive my BMW with a P1420 code?

You can drive with this code temporarily, but it’s best to address it promptly to avoid potential emissions system damage.

7. How do you fix a P1420 code on a BMW?

Repairs may include replacing the secondary air valve, repairing damaged wiring, replacing a faulty relay, or fixing the secondary air pump.

8. How much does it cost to fix the P1420 code on a BMW?

Repair costs vary but can range from $100 for a simple wiring fix to $500 or more if the secondary air valve or pump needs replacement.

9. Will clearing the P1420 code without repairs solve the issue?

No, clearing the code will temporarily remove the check engine light, but the issue will likely return until the underlying fault is fixed.

10. Can a clogged secondary air pump cause the P1420 code?

Yes, a clogged or malfunctioning secondary air pump can cause the P1420 code by failing to properly regulate airflow.

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