AfterMarketNews Auto Care Pro AutoProJobs Auto-Video.com Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service

Woman’s Tough Road Leads To Ownership Of Triangle Tires

Women auto shop owners aren’t rare anymore, but the story of Gina Paschall, owner of Triangle Tires in North Carolina, is definitely unique. According to The News & Observer in Raleigh, NC, Paschall, now 51, became a ward of the state at 5 years...

Read more...

Google Your Shop - What Do You See?

Go and enter the name of your shop at Google.com. Try putting quote marks around the name of your shop, like “Main Street Auto Care.” Now try entering the city where you are located with the name of your shop. What did you find? Your shop’s website?...

Read more...

Tennessee Shop Offers Discounts To Customers In Need

Price is often the biggest sticking point in an auto repair job. Some customers just have no feel for what certain services or parts cost, others have perhaps been treated poorly in the past (or are cheap), and some just flat out do not have the money....

Read more...

Vehicle Unit Increase; Import-Rich VIO Are A Boon for Import Specialists

Need a dose of good news for your business? Then hear this: The influx of new vehicles in the market will lay the foundation for bountiful aftermarket service and repair opportunities. And, with import vehicle sales continuing an ­upward climb, there...

Read more...

Honda: Engine Shuts Off, But Power Mode Stays In ‘On’ or ‘Accessory’

Applies To: Honda Insight models with one-push start Customers might complain that when they shift into park and shut off the engine, that the power mode stays in On or Accessory. Honda says the culprit could be a misadjusted shift cable. If the...

Read more...

Import Oil Specification Primer

As engine technology has evolved and fuel efficiency standards have tightened, oil specs have increased in importance. Using the wrong viscosity could set a fault code in some applications or interfere with the normal operation of the variable valve...

Read more...

10 Alignment Tips to Help You See Past The Angles

1. Talk to the driver. Always ask questions at the time the vehicle is written up. Find out why customers think they need an alignment. 2. Take notes. Nothing is worse than a repair order that just says “perform alignment” or “needs alignment.”...

Read more...

What to Know About Modern Air Ride Systems

GM, Ford, BMW and just about every other manufacturer has a 10-year-old vehicle on the road with an air ride suspension at the rear or at all four corners. These systems could be as exotic as a Land Rover Defender or as common as a Ford Explorer....

Read more...

Slipping Clutch: Improper Flywheel Step and Cup Dimensions

Slipping is one of the most common clutch related concerns. A slipping condition can occur after years of service or immediately after installation of a new clutch and is caused by various scenarios. One of the most commonly seen and easily prevented...

Read more...

Ingersoll Rand Becomes ‘Official Power Tools of NASCAR’

NASCAR and Ingersoll Rand have announced a multi-year partnership designating Ingersoll Rand as the “Official Power Tools of NASCAR.” The multi-faceted agreement also designates Ingersoll Rand as an Official Partner of the International Motorsports...

Read more...

2015 Vehicle Lifting Points Guide Now Available

The Automotive Lift Institute, Inc. (ALI) announces the availability of the 2015 edition of ALI’s “Vehicle Lifting Points for Frame Engaging Lifts.” This updated guide is a quick-reference single-source manual for lifting point information as...

Read more...

Pulling Codes: P0302: Cylinder 2 Misfire Detected Intermittent Activity

  This article will address a misfire code from a different vantage point. It will look at a plan of attack for when a code is being set intermittently. The code we are referencing is P0302-Cylinder No. 2 Misfire Activity Detected. While...

Read more...

Home Emissions Tech Tip: VW’s Check Engine Light is On with Fault Code P0411

Print Print Email Email

Vehicle Application:
1998 Audi A4 Quattro 2.8L, A6 Quattro 2.8L, Volkswagen Jetta GLX 2.8L;
1999 A6 Quattro Avant 2.8L;
2000 A4 Quattro Avant 2.8L, A6 Quattro 2.8L, A6 Quattro Avant 2.7L, Beetle 1.8L, GAS, Turbo; Golf 1.8L, GAS, Turbo; Jetta GLS 1.8L Turbo; Passat 2.8L;
2001 A6 Quattro Avant 2.7L, A8 Quattro 4.2L, A8 Quattro L 4.2L, TT Quattro 1.8L and Jetta GLS 1.8L Turbo;
2002 Audi A6 Quattro 4.2L, S4 Avant 2.7L, Jetta GLS Wagon 1.8L, Passat 1.8L Turbo and Passat 4 Motion 2.8L;
2003 A4 Quattro 1.8L, A6 Quattro 4.2L, A6 Quattro Avant 2.7L, Passat 1.8L Turbo;
2004 A6 Quattro 2.7L Turbo, Jetta 1.8L; and
2005 Golf GTI 1.8L Turbo

Customer Concern
The Check Engine Light (MIL) is on and fault code P0411 (16795) is stored in the fault memory.

Potential Causes
• Restricted Cylinder Head Secondary Air Passages
• Low Engine Vacuum
• Defective Secondary Air Combination Valve
• Defective Secondary Air Injection Solenoid Valve N112
• Defective Secondary Air Pump Relay J299
• Defective Secondary Air Pump V101

Tech Tips
The secondary air injection (AIR) system blows air into the exhaust, behind the exhaust valves, via a passage in the cylinder head. 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.

When the engine is started cold, the engine control module (ECM) activates the AIR pump motor V101 via the secondary air injection pump relay J299. The secondary air injection solenoid valve N112 also is activated. With the V101 pump and the N112 solenoid active, pressurized air and manifold vacuum are passed to the combination valve on the head.

Manifold vacuum signal from the N112 solenoid opens the combination and allows the pressurized air produced by the V101 pump to enter the exhaust behind the exhaust valves. 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.

Diagnostic Codes
16795, 17819, 17822, 17831, 17832, P0411, P1411, P1414, P1423, P1424

Tests/Procedures
1. Verify engine vacuum. The AIR system needs the full 18-22” of vacuum to operate correctly. A vacuum leak anywhere in the intake system can affect the AIR system. The best way to check for a vacuum leak is with a smoke machine directly after the mass air flow (MAF) sensor. Taking shop air with an external pressure regulator set to 5 psi is a good way to help find any small leaks.

2. Verify operation of the combination valve. Put a vacuum pump to the valve. The valve should hold a vacuum. Apply and release vacuum to the valve repeatedly. Movement of the diaphragm should be felt.

3. With a factory-compatible scan tool:
  a. Enter Address Word 01-Engine Management.
  b. Select Function 03-Output Diagnostic Test Mode (DTM). This is an actuator test. The AIR pump relay J299 should get pulsed a ground and the AIR pump V101 should cycle on and off. The AIR solenoid valve N112 should also get pulsed a ground. The valve should click.

4. Bypass the AIR relay J299 and make the AIR pump V101 run continuously. The pump should put out a strong, forceful amount of air (approximately5 psi). Verify that there is no air leaking around the case of the AIR pump.

5. Verify that the air leaving the AIR pump V101 is reaching the combination valve and is not leaking out of a cracked hose.

6. With the engine idling, put a vacuum gauge in place of the combination valve. Electrically unplug the AIR solenoid N112:
  a. There should be no vacuum reading on the gauge.
  b. Manually apply power and ground to the solenoid. Full manifold vacuum should be read on the gauge.
  c. Remove power and ground to the solenoid. Vacuum should drop off within a few seconds down to no vacuum.

7. If all previous tests pass, the issue could be a carbon buildup issue inside the cylinder head. To test for carbon buildup:
  a. Remove all spark plugs from the engine.
  b. Force air into the cylinder head. (Either by removing the combination valve and using shop air or by manually activating the V101 pump and applying vacuum to the combination valve.)
  c. Turn the engine over by hand. As each cylinder comes up on the exhaust stroke, air should be felt coming from the spark plug hole. Equal amounts of air should be felt from all spark plug holes.

8. If all tests pass, there could be a potential sensor issue with the O2 sensors or MAF sensor.

Courtesy of Identifix.

The following two tabs change content below.
Latest articles from our other sites:

Mitchell 1 To Hold This Year's First Shop Management Workshop In Scottsdale

Mitchell 1 will hold this year’s first Shop Management Workshop, April 30 – May 2 in Scottsdale, Ariz. at the Scottsdale Plaza Resort. The training is designed for shop management software users who...More

New Snap-on 18 Volt Lithium Compact Impact Provides Monster Torque

The new Snap-on 18 Volt 3/8-inch Cordless Impact (CT8810A) may be compact in size, but is a monster performer. The CT8810A features a slender design and balanced ergonomic control, making it easy to use...More

Vehicle Unit Increase; Import-Rich VIO Are A Boon for Import Specialists

Need a dose of good news for your business? Then hear this: The influx of new vehicles in the market will lay the foundation for bountiful aftermarket service and repair opportunities. And, with import...More

Honda: Engine Shuts Off, But Power Mode Stays In ‘On’ or ‘Accessory’

Applies To: Honda Insight models with one-push start Customers might complain that when they shift into park and shut off the engine, that the power mode stays in On or Accessory. Honda says the culprit...More

10 Alignment Tips to Help You See Past The Angles

1. Talk to the driver. Always ask questions at the time the vehicle is written up. Find out why customers think they need an alignment. 2. Take notes. Nothing is worse than a repair order that just...More

What to Know About Modern Air Ride Systems

GM, Ford, BMW and just about every other manufacturer has a 10-year-old vehicle on the road with an air ride suspension at the rear or at all four corners. These systems could be as exotic as a Land...More

New Snap-on 18 Volt Lithium Compact Impact Provides Monster Torque

The new Snap-on 18 Volt 3/8-inch Cordless Impact (CT8810A) may be compact in size, but is a monster performer. The CT8810A features a slender design and balanced ergonomic control, making it easy to use...More

Hannay Reels' N800 Series Features Non-Sparking Ratchet Assembly

The narrow, compact N800 Series reels are ideal for fuel dispensing, waste/oil evacuation, air and water operations. A declutching arbor and non-sparking ratchet assembly prevents damage when reverse...More