1976 VW air cooled, fuel injected, no A/C. What is this tube, and how do I fix it, now that its broken?

P0411 - Secondary Air Injection (AIR) system upstream flow The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.

• AIR bypass solenoid circuit open.
• AIR bypass solenoid leaking/blocked or stuck open/closed.
• Electric AIR pump - no/low air flow.
• AIR diverter valve leaking/blocked or stuck open/closed.
• AIR air hoses restricted or leaking.
• AIR vacuum hoses restricted or leaking.

In order to test the AIR pump, it must be capable of driving the HO2S lean.
A single electrical circuit open, such as an AIR bypass solenoid, in this multi-component circuit will not be detected by a PCM output driver circuit, yet it will create DTC P0411.
P0455 - EVAP Control System Leak Detected (No Purge Flow or Large Leak) The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak, or multiple small fuel vapor leaks. System failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak, or multiple fuel vapor leaks are detected by the EVAP Running Loss monitor test with the engine running (but not at idle).

• After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications.
• Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube, or EVAP return tube.
• EVAP canister purge valve stuck closed.
• Damaged EVAP canister.
• Damaged or missing fuel filler cap.
• Insufficient fuel filler cap installation.
• Loose fuel vapor hose/tube connections to the EVAP system components.
• Blockages or restrictions in the fuel vapor hoses/tubes (items also listed under disconnections or cracks).
• Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked.
• Canister vent (CV) solenoid stuck open.
• Mechanically inoperative fuel tank pressure (FTP) sensor.

Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank.
P0480 - Cooling Fan Electrical Malfunction
Variable Speed Electric Cooling Fan This test checks the Fan Control - Variable (FCV) output circuit. The DTC sets if the PCM detects the voltage on the FCV circuit is not within the expected range.

• FCV circuit open or shorted.
• B+ or ground circuit fault to cooling fan.
• VPWR open to cooling fan (if applicable).
• Damaged cooling fan module.
• PCM damaged.

During the KOEO self-test, the cooling fan is cycled on and off.
P0660 - Intake Manifold Tuning Valve (IMTV) Control Circuit Open - Bank 1 The IMTV system is monitored for failure during continuous, KOEO, or KOER self-tests. The test fails when the signal on the monitor pin is more or less than an expected calibrated range.

• IMTV signal circuit open, shorted to PWR GND or SIG RTN.
• Damaged IMTV actuator.
• Damaged PCM.

An IMTVM PID reading may indicate a fault if available.

Every one of these I work on usually has a bad coolant or air temp sensor.

P0411 Secondary Air Injection System Incorrect Flow Detected

www.obd-codes.com/p0411

Detailed information on troubleshooting and repairing a P0411 DTC code which has to do with the secondary air ... OBD-II Trouble Code Technical Description.

VW Emissions Code P0411. How to fix it, Quick and Easy ...

? 2:42
https://www.youtube.com/watch?v=x2ul9mbEFZM
Oct 1, 2012 - Uploaded by Keelan Hawkins
VW Emissions Code P0411. .... VW 1.8T Secondary Air Injection Pump Replacement for Fault Code P0411 - Duration: 8:48. by Deutsche Auto ...

the fuel tank may need cleaning, sediment appears to be blocking the pick up tube when tank is at quarter, or the pick up tube may be broken at that height and the system cavitates at 1/4 tank

Go to the VW dealer and show a parts tech what you need.

check the fuel pump and regulater, the fuel filter's and the air filter, also check the turbo intake tubing for loose clamps and broken boots

CHECK FUEL PUMP RELAY IF GOOD WITH DOOR OPEN TURN KEY ON LISTEN FOR SHORT FUEL PUMP NOISE. FUEL PUMP IS IN TANK.

IF I DONT RUN DG GAS DRYER IN MY 98 BEETLE , AND MOTORCYCLE PATTERN OIL , MINE WILL NOT ACT RIGHT , AND THIS CAR RUNS PERFECT EVERY DAY EVEN IN -40 TO -50 TEMPS SOMETIMES , IN ALBERTA, TRY MOTUL 300V OIL , 5W30, AND GAS DRIER , THESE CARS HATE MOISTURE IN THE FUEL , ALSO TRY NOT TO RUN PREMIUM GAS , BECAUSE NOBODY BUYS IT , THE CAR WILL GET A TANK FULL OF WATER, MY CAR HAS 89000 MILES ON IT AND WORKS BETTER THAN MOST NEW ONES, HOPE THIS HELPS, EVEN IN THE SUMMER RUN GAS DRYER EVERY COUPLE TANKS , DONT NEED MUCH, THE TACH WILL SMOOTH OUT QUICK,ALSO IF ANYONE NEEDS A BLOCK HEATER FOR A 2.0 LITRE BEETLE , MINE HAS ONE FOR A GOLF , AND WORKS PERFECT, ALSO THERE IS AN OIL PAN HEATER THAT I HAVE ALSO , IN CASE IT WAS NEEDED.

P0410 Secondary Air Injection System
"Secondary Air" is an abbreviated term for the "Secondary Air Injection System". This system uses a separate air pump and a series of metal and rubber tubes to force outside air into the exhaust stream and help the catalytic converter burn away excessive emissions.

Possible causes and fixes are:
#1 Poor connection, rubbed-through wire insulation or a broken wire inside the insulation.

#2 Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness.

#3 Check for worn or loose AIR pump drive belt.

#4 Check for pinched, kinked or restricted AIR pipes, hoses or fittings.

Problems with this system can stem from electrical circuits, solenoids, or switches that control the pump and valves. Other problems include sticking valves, loose, rusted, or poorly connected lines, a broken drive belt, or possibly a bad pump.

Hi, before the pump it is a loose connection or maybe a pin hole in the pipe, check all the connections and pipes for seepage, after the pump it will be a leak, i knowit sounds the same but after the pump the fuel is under pressure. It would appear that your system drawing air rather than forcing air in. daveg