Audi Cars & Trucks - Recent Questions, Troubleshooting & Support
2006 Audi A8 EPC and check engine light.
Let's break down the situation:
EPC Light:
The EPC light typically comes on when there's a problem with engine sensors or components. It might be related to the throttle sensor or the temperature sensor.
When the EPC light activates, the engine electronics may limit power and maximum RPM. As a result, the computer might restrict the engine's performance, allowing you to drive at low speeds only.
Check Engine Light:
The Check Engine light illuminates when the engine management system detects a fault or error.
The codes you've provided indicate specific issues:
Code 17950/P1542/005442: Angle sensor 1 for Throttle Actuator (G187) has an implausible signal.
Code 16891/P0507/001287: Idle Control System RPM is higher than expected.
Possible Causes and Solutions:
Fuel System Issues: Given the fault codes related to fuel pressure, it's essential to check the fuel system. Low fuel pressure could cause hesitation and trigger both lights.
Mass Airflow Sensor (MAF): A faulty MAF sensor can lead to engine hesitation, rough idling, and stalling. Consider inspecting or replacing the MAF sensor.
Throttle Body: Although the dealer replaced the throttle body earlier, it's worth verifying its functionality again.
Idle Control System: The high RPM issue might be related to the idle control system. Inspect the idle control valve and related components.
Wiring and Connections: Check for loose or damaged wiring, connectors, and vacuum lines.
Next Steps:
Diagnostic Scan: Perform a thorough diagnostic scan to identify any additional fault codes.
Visual Inspection: Inspect the throttle body, angle sensor, and wiring connections.
Fuel Pressure Test: Verify fuel pressure using a fuel pressure gauge.
MAF Sensor: Consider cleaning or replacing the MAF sensor.
Idle Control Valve: Inspect the idle control valve for proper operation.
Remember that intermittent issues can be challenging to diagnose. If the problem persists, consult a qualified mechanic or an Audi specialist to pinpoint the exact cause and address it effectively.
Audi A4 "left dipped headlight" problem
I have the same issue on my 2002 A4. According to my Audi dealer mechanic, there is a sensor on the front suspension that controls the angle of the headlight. Replacing this may resolve the issue.
10/24/2023 11:44:17 PM •
2002 Audi A4
•
Answered
on Oct 24, 2023
What can cause vibration from right rear wheel
The most common reasons are listed below. As you vehicle is reasonably new some of the one further down the list will be less likely but it does happen. How long after the repair did the vibration start? If it was on the same day or a few days after take it back to the repairer so they can check their work. On rare occasions even brand new parts can be faulty. It's happened to me with a front wheel bearing. 80 miles and it made more noise than the old one.
I would suggest you get the first 2 on the list checked first as these are the cheaper and simpler fixes.
Wheel and tyre not balanced,
Badly worn tyre,
Warped brake disc,
Worn wheel bearing,
Worn CV joint,
Drive shaft out of balance,
Worn suspension parts.
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