Repair or replace as necessary. The valve should hold vacuum. As each cylinder comes up on the exhaust stroke, air should be felt coming from the spark plug hole. There are a few things to inspect when this code comes up. What is a bearing bridge? Blow lightly into disconnected pressure hose, Combi-Valve should be closed.
The light will remain on until normal operation occurs or repairs are performed. The positive side is you've probably worked on these models for a long and know them well. Enter Address Word 01-Engine Management. How does a mechanic diagnose the P0411 code? It was an auction purchase and brought in by the purchasing dealer for intermittent stalling and not restarting. Remove power and ground to the solenoid.
This is an actuator test. If the P0411 code does return, we will need to test the sensor and its associated circuits. Afterwards let them air dry, get some dielectric grease same stuff they use for light bulb sockets and spark plug wires and put some where the terminals come into contact. Code P0411 will set if the O2 sensors do not see a large enough change in exhaust gas oxygen when the secondary air injection system is active. Listen and feel for exhaust hissing at the check valves.
Check hoses and components of Secondary Air Injection System, for damage, loose fit and improper installation, check vacuum hoses for Secondary Air Injection System. With a factory-compatible scan tool: a. If Combi-Valve opens when vacuum is applied, Combi-Valve is okay. If the turbo bypass or over-run cut off solenoid valve does not hold vacuum it can cause a secondary air fault. System Pressure Sensor Circuit Low Input is now set after more than 15 seconds. What repairs can fix the P0411 code? Turn the engine over by hand.
If the pump runs, find another relay identical to the one removed from the A. Spark plugs typically need to be replaced every season or 25 hours of use. Looks like this one needed some patience. Remove all spark plugs from the engine. If these codes are present, diagnose them before attempting to diagnose the P0411. An electric air pump draws fresh air and pumps it into the exhaust in order to accelerate catalytic converter operation.
Anyway it pulls out P0411,. Either by removing the combination valve and using shop air or by manually activating the V101 pump and applying vacuum to the combination valve. How serious is the P0411 code? This amount is set by the manufacturer. The also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Specialized carbon cleaners are used to remove the carbon particles carefully. Technicians use this information to test the air injection system and determine which part is not functioning as designed.
With the engine cold, start engine. Pull the connectors apart and carefully inspect the terminals the metal parts inside the connectors. Vacuum should drop off within a few seconds down to no vacuum. Full manifold vacuum should be read on the gauge. Common mistakes when diagnosing the P0411 code The most common mistake is made when unneccessary components are replaced within the air injection system - usually when parts are just clogged but have not actually failed. This causes the Check Engine Light to be set and displayed on the dashboard. The sensor is usually part of the Secondary Air Check Valve.
This extra air injection takes place on a cold engine 5°-33° C engine coolant temperature for about 100 seconds and serves to quickly heat the catalytic converter for improved emissions. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. Equal amounts of air should be felt from all spark plug holes. Vehicle Application: 1998 Audi A4 Quattro 2. Nov 13, 2015 The P0411 code is secondary air injection system the air injection system does not detect air in the exahaust when introduced by the secondary air injection system could be electric air pump hose from air pump leak or blocked air bypass solenoid blocked or not working get a mechanic to look at your car Mar 02, 2011 System Too Lean Bank 1 Basically this means that an oxygen sensor in bank 1 detected a lean condition too much oxygen in the exhaust. Also, check for active Secondary A.