P1691 Audi Code - Malfunction Indicator Lamp Open Circuit
Quick Answer
The Malfunction Indicator Lamp (MIL) lights up when emissions relevant malfunctions are recognized by the Engine Control Module (ECM). Common causes include Faulty Malfunction Indicator Lamp (MIL), Malfunction Indicator Lamp harness is open or shorted, Malfunction Indicator Lamp circuit poor electrical connection. 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
- P1691 Audi indicates Malfunction Indicator Lamp Open Circuit.
- Common causes
- Common causes include Faulty Malfunction Indicator Lamp (MIL), Malfunction Indicator Lamp harness is open or shorted, Malfunction Indicator Lamp circuit poor electrical connection.
- 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.
Code P1691 Audi Description
What are the Possible Causes of the DTC P1691 Audi?
- Faulty Malfunction Indicator Lamp (MIL)
- Malfunction Indicator Lamp harness is open or shorted
- Malfunction Indicator Lamp circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1691 Audi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1691 Audi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1691 Audi Code
1. What does the OBDII code P1691 mean on an Audi?
P1691 indicates a Malfunction Indicator Lamp (MIL) Open Circuit, meaning there is an issue with the circuit controlling the check engine light.
2. What are common symptoms of code P1691 on an Audi?
Symptoms include the check engine light failing to illuminate during startup or remaining off despite active fault codes.
3. What causes the P1691 code on an Audi?
Possible causes include a damaged MIL bulb, faulty wiring or connectors in the circuit, or a malfunctioning engine control module (ECM).
4. Can driving with the P1691 code cause further damage to my Audi?
While the code itself may not directly affect performance, you won’t be alerted to other critical issues since the MIL is inoperative.
5. How do I diagnose the P1691 code on an Audi?
Inspect the MIL bulb, check the wiring and connectors for damage or corrosion, and test the ECM for faults using a diagnostic tool.
6. How can I fix the P1691 code on my Audi?
Repairs may involve replacing the MIL bulb, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM.
7. What tools are needed to troubleshoot the P1691 code?
You’ll typically need an OBDII scanner, a multimeter, and basic tools for inspecting and repairing wiring.
8. Is the P1691 code specific to Audi vehicles?
No, P1691 can appear on other vehicles, but its exact meaning and troubleshooting steps may vary by manufacturer.
9. How much does it cost to repair the P1691 code on an Audi?
Costs vary depending on the issue, but replacing a MIL bulb may be inexpensive, while ECM repairs or replacements can be more costly, ranging from $100 to $1,000 or more.
10. Can I reset the P1691 code without fixing the issue?
You can clear the code with an OBDII scanner, but it will likely return unless the underlying problem is resolved.
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