Question about 2005 Audi A3

1 Answer

Management light Cat problem code

2004 Audi Cab 1.8T, Engine management light on, diagnostics point to Cat, new cat fitted (not audi) twice, no go so garage changed final lamba after cat, definetly it they said back onagain after 20 miles. No performance or economy probs.
Just......annoying Getting desparate now after much £££ spent!

Posted by on

  • lbailey388 Jan 18, 2009

    Hi

    Thanks vet much for the reply's

    The fault code is 16804 CAT SYSTEM CYL BANK 1P0420

  • Roberta Smith
    Roberta Smith May 11, 2010

    what was the code(s) you were getting ?



    Robert

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

You mentioned a non genuine cat being fitted. That in itself is not too much of a problem, however, non genuine oxygen sensors are. There is a huge difference in quality between the genuine article and cheep alternatives on the after market. I very much suspect your fault code has been tripped by such a replacement part. Exceptionally complex engine management control systems just cant recognise the electronic info thats being sent by non-gen sensors, so its a false economy to fit these. Also one thing to bear in mind for the future is to avoid using super market fuels. Its a common belief that all fuels are the same and it all comes from the same tankers, etc etc. This is absolute rubbish. Its like comparing a 20 year old single malt Scottish Whiskey with a Happy Shopper bargain blend. It may look the same, but there's simply no comparison. Prolonged use of these cheep fuels will produce long term running problems. Also dont forget, there are pre and post catalytic converter oxygen sensors on your car, so the bills can get expensive. Good luck

Posted on Jan 17, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Shuts off when warm wont stat until cool


audi tt sensors - forum about car parts and car advices

abmforum.com/audi-tt-sensors.html
audi tt sensors 2004 audi tt coupe windows roll down hi all only new to forum 2001 ...2002 audi tt purchase advice newbie looking to get a tt. ... Used on cold starts towarm engine and cat faster. .... replaced and sending my car into limp mode. my ac just shut off one day and will not turn back on. the esp in the car is stuck off.

Sep 22, 2015 | 2002 Audi TT

1 Answer

Engine managment light stays on


Read the code then get back by answering this post

Jan 31, 2013 | 2004 Rover 25 1.4

1 Answer

Engine management light has come on and won't go over 30 mph, please help!!!


Have the vehicle scanned for codes and do the repairs accordingly.
Sounds like a clogged Cat.

May 14, 2010 | 2003 Audi A4 Cabriolet

2 Answers

Misfire


Sounds like the Catalytic converter needs to be looked at or replaced.

Oct 02, 2009 | 1997 Audi A8

1 Answer

Indication lamp shining


That's the motor-management warning light. Meaning: serious errors are being detected by the motor-management computer (= ECU). You should have a dealer readout those ECU faultcodes using VAGCOM to determine the cause a.s.a.p, before (more) harm is done to the engine.

Please be aware that your motor could also switch to "failsafe" mode when too many severe errors are detected, meaning it's terribly slow to drive and turbo-pressure is nearly non-existing.

Mar 21, 2009 | Audi A4 Cars & Trucks

1 Answer

Audi A4 Cab


It appears you have a bad o2 sensor


Robert

Jan 18, 2009 | 2004 Audi A4

1 Answer

Fitting a dump valve to a audi a3 1.8t


Don't do this on an Audi. They have used a recirc valve because the mass-airflow metering system on the car is telling the engine that a certain amount of air is coming, and the engine is being fueled accordingly. If you use a blowoff valve to purge excess boost air to the atmosphere, the engine will still be expecting to see this air and will be fueling accordingly, and you'll get a rich spike every time you shift. This rich spiking has been proven MANY times to degrade and eventually clog/ruin the catalytic converter and O2 sensors. Some mass-air metered cars (less precise cars in terms of engine management) are fine when DVs are replaced with BOVs, but not Audi/VW cars - using an atmospheric dump will destroy your cat and O2 sensors (plan on $1500+ to fix this).

Oct 18, 2008 | Audi A3 Cars & Trucks

1 Answer

ENGINE MANAGEMENT LIGHT ON, CAR RUNNING OK,DIAGNOSTIC SAYS PROBLEM WITH CAT OR SENSOR. HAD CAT REPLACED TWICE HAD EGON SENSOR REPLACED 3 TIMES, LIGHT STILL ON


seems to be like the people working on your car are just guessing, but let me know what codes do you come with and i will do my best to try to help you, with out having the car here.

Jul 20, 2008 | 2000 Ford Focus

Not finding what you are looking for?
2005 Audi A3 Logo

Related Topics:

230 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

21927 Answers

yadayada
yadayada

Level 3 Expert

60541 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

13152 Answers

Are you an Audi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...