N80 and thrust sensor are different components. In order to clear the cel you will need some form of basic scan tool, or you can always disconnect the negative battery cable. Clearing with a scan tool is the preferred/better method. Step 1 is to scan and see what the trouble code is. rough, erratic idle and intense shudder. Since late summer I've been having a disturbing issue on my '10 A4 P+. Started around 19k miles (now have almost 22k). Rough, erratic idle rarely at first start but more often at a stop sign or stop light or in park, regardless of temperature or length of drive. Once, the check engine light flashed Audi A4 P0300 Symptoms. Check Engine Light is on or flashing; Engine runs rough, hesitates, or jerks when accelerating; DIY Steps to Diagnose Audi A4 Code P0300. Engine code P0300 could be caused by a number of things, including faulty spark plugs, faulty ignition system, distributor failure, and more. P0420 Diagnosis: Audi A4. The most common fix for P0420 in the Audi A4 is a new catalytic converter, followed by an O2 sensor replacement. Before taking your A4 into an exhaust shop for an (expensive) new catalytic converter, let's ensure that's what you need. Here's a good P0420 diagnostic order for the Audi A4: 1. Check for Other Codes. Wait about 10 seconds. Fully depress the accelerator pedal and keep it for more than 10 seconds. Fully release the accelerator pedal (The CEL light will continue to blink). Turn ignition switch to On position and now you can start the car. The CEL light should be gone. Clear your A4's DTC codes with a scanner. Start the engine and wait for the check engine light to come back on. If it changed to a different P030X code, the plug was bad. If nothing changed, do this for the coil packs and plug wires (if equipped). If the code stays P0304, you've ruled out the most common causes of this code. 2. Diagnosis The $7E8 code typically refers to the engine, while the $7E9 code refers to the transmission. These are CAN codes so you have a PCM or BCM that is not working but I have seen these cars needing a TIPM which is easy to replace because it self initializes. So I got a check engine light last night after reaching about 5000 rpms (don't go that high too often) and took it to Autozone and got this code pulled. i just had this code with my 06 A4. ended up being a bad wastegate and the whole turbo assembly was replaced 06-29-2010 09:53 AM #12. CystmX. 2005.5 Audi A4 B7 2.0TFSI Quattro 6MT This article applies to the Audi A3, A4 B7/B8, A6 C5/C6, Q5/Q7. There are a number of reasons why a warning light might appear on the dashboard of your Audi. The most likely reason, however, is that a component is malfunctioning or is in need of additional fluid or a new filter. While you might be tempted to ignore such warnings, it's highly P0411 VW/Audi Engine Code: Secondary Air Injection System - Insufficient Flow Detected What symptoms can you look for when you get a P0411 engine code? P0411 VW Symptoms. Check Engine Light (CEL) Illuminating; Secondary air pump making a whishing sound; Engine backfiring; The Audi A4 has been produced across 9 different generations idHOwt.