2005 Audi A4 emission

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Condition	Value

expand_moreDiesel exhaust gas values

expand_moreCut-off control speed


All Audi diesel V6 2.5 L BDG engines	4650–4950 rpm4650–4950 rpm4650–4950 rpm

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	4800–5200 rpm4800–5200 rpm4800–5200 rpm
BRE engine	4800–5200 rpm4800–5200 rpm4800–5200 rpm


All Audi diesel V6 2.7 L BSG engines	3650–4750 rpm3650–4750 rpm3650–4750 rpm
All other modifications	4800–5200 rpm4800–5200 rpm4800–5200 rpm

expand_moreDiesel conditioning gas injections

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	10
from 60° C engine oil temperature
BRE engine	10
from 60° C engine oil temperature


All other modifications	10
from 60° C engine oil temperature

expand_moreDiesel conditioning speed


All Audi diesel V6 2.5 L BDG engines	4650–4950 rpm4650–4950 rpm4650–4950 rpm
from 60° C engine oil temperature 10 gas impulses

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature
BRE engine	4800–5200 rpm4800–5200 rpm4800–5200 rpm


All Audi diesel V6 2.7 L BSG engines	3650–4750 rpm3650–4750 rpm3650–4750 rpm
from 60° C engine oil temperature 10 gas impulses
All Audi diesel straight-4 2.0 L BVF engines	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature 10 gas impulses
All Audi diesel straight-4 2.0 L BVG engines	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature 10 gas impulses
All other modifications	4800–5200 rpm4800–5200 rpm4800–5200 rpm
from 60° C engine oil temperature

expand_moreMaximum K-value


All Audi diesel V6 2.5 L BDG engines	2 1/m2 1/m2 1/m
All Audi diesel straight-4 1.9 L BKE engines	2 1/m2 1/m2 1/m

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	2 1/m2 1/m2 1/m
BRE engine	1.5 1/m1.5 1/m1.5 1/m


All Audi diesel straight-4 2.0 L BNA engines	2 1/m2 1/m2 1/m
All Audi diesel straight-4 1.9 L BRB engines	2 1/m2 1/m2 1/m
All Audi diesel straight-4 2.0 L BRF engines	2 1/m2 1/m2 1/m
All other modifications	1.5 1/m1.5 1/m1.5 1/m


Measuring mode	B
Measuring sensor	1

expand_moreMeasuring time

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	0.5 s0.5 s0.5 s
BRE engine	0.5 s0.5 s0.5 s


All other modifications	0.5 s0.5 s0.5 s


Stoppage time	1 s1 s1 s

expand_moreGeneral exhaust gas values


Diagnostic socket location	The diagnostic socket is at the lower edge of the dashboard on the driver's side.

expand_moreExhaust gas recirculation (EGR)


2.0 TDI with diesel straight-4 2.0 L 125 HP engine (2005.11–2006.11)	Yes

expand_moreIdling speed with automatic gearbox


All Audi gasoline straight-4 2.0 L ALT engines	700–960 rpm700–960 rpm700–960 rpm
All Audi gasoline V6 3.1 L AUK engines	600–800 rpm600–800 rpm600–800 rpm
All Audi gasoline V6 3.0 L BBJ engines	680–800 rpm680–800 rpm680–800 rpm
All Audi diesel V6 2.5 L BDG engines	660–860 rpm660–860 rpm660–860 rpm
All Audi gasoline straight-4 1.8 L BFB engines	650–850 rpm650–850 rpm650–850 rpm
All Audi gasoline straight-4 2.0 L BGB engines	550–800 rpm550–800 rpm550–800 rpm

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	730–930 rpm730–930 rpm730–930 rpm
BRE engine	800–1000 rpm800–1000 rpm800–1000 rpm


All Audi diesel straight-4 2.0 L BNA engines	730–930 rpm730–930 rpm730–930 rpm
All Audi gasoline straight-4 2.0 L BPG engines	550–800 rpm550–800 rpm550–800 rpm
All Audi diesel straight-4 2.0 L BPW engines	800–1000 rpm800–1000 rpm800–1000 rpm
All Audi diesel straight-4 2.0 L BRF engines	730–930 rpm730–930 rpm730–930 rpm
All Audi diesel V6 2.7 L BSG engines	660–860 rpm660–860 rpm660–860 rpm
All Audi diesel straight-4 2.0 L BVG engines	800–1000 rpm800–1000 rpm800–1000 rpm
All Audi gasoline straight-4 2.0 L BWE engines	550–800 rpm550–800 rpm550–800 rpm
All Audi gasoline straight-4 2.0 L BWT engines	550–800 rpm550–800 rpm550–800 rpm

expand_moreIdling speed with manual gearbox


All Audi gasoline straight-4 2.0 L ALT engines	700–960 rpm700–960 rpm700–960 rpm
All Audi gasoline straight-4 1.6 L ALZ engines	700–960 rpm700–960 rpm700–960 rpm
All Audi gasoline V6 3.1 L AUK engines	600–800 rpm600–800 rpm600–800 rpm
All Audi gasoline V6 3.0 L BBJ engines	680–800 rpm680–800 rpm680–800 rpm
All Audi diesel V6 2.5 L BDG engines	660–860 rpm660–860 rpm660–860 rpm
All Audi gasoline straight-4 1.8 L BFB engines	650–850 rpm650–850 rpm650–850 rpm
All Audi gasoline straight-4 2.0 L BGB engines	550–800 rpm550–800 rpm550–800 rpm
All Audi diesel straight-4 1.9 L BKE engines	780–980 rpm780–980 rpm780–980 rpm

expand_moreAll Audi diesel straight-4 2.0 L BLB engines


BLB engine	730–930 rpm730–930 rpm730–930 rpm
BRE engine	800–1000 rpm800–1000 rpm800–1000 rpm


All Audi diesel straight-4 2.0 L BNA engines	730–930 rpm730–930 rpm730–930 rpm
All Audi gasoline straight-4 2.0 L BPG engines	550–800 rpm550–800 rpm550–800 rpm
All Audi diesel straight-4 1.9 L BRB engines	780–980 rpm780–980 rpm780–980 rpm
All Audi diesel straight-4 2.0 L BRF engines	730–930 rpm730–930 rpm730–930 rpm
All Audi diesel V6 2.7 L BSG engines	660–860 rpm660–860 rpm660–860 rpm
All Audi gasoline straight-4 2.0 L BUL engines	710–860 rpm710–860 rpm710–860 rpm
All Audi gasoline straight-4 2.0 L BWE engines	550–800 rpm550–800 rpm550–800 rpm
All Audi gasoline straight-4 2.0 L BWT engines	550–800 rpm550–800 rpm550–800 rpm
All other modifications	800–1000 rpm800–1000 rpm800–1000 rpm


Minimum engine oil temperature at VET	176°F176°F80°C

expand_morePetrol exhaust gas values


CO content at idling speed	0–0.5 %0–0.5 %0–0.5 %

expand_moreCO content at increased idling speed


All Audi gasoline straight-4 1.6 L ALZ engines	0–0.3 %0–0.3 %0–0.3 %
All other modifications	0–0.2 %0–0.2 %0–0.2 %


Delta lambda	0.03 λ0.03 λ0.03 λ

expand_moreIncreased idling speed


All Audi gasoline straight-4 1.6 L ALZ engines	2500–3200 rpm2500–3200 rpm2500–3200 rpm
All Audi gasoline straight-4 2.0 L BGB engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BPG engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BUL engines	3800–4500 rpm3800–4500 rpm3800–4500 rpm
All Audi gasoline straight-4 2.0 L BWE engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BWT engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All other modifications	2500–3000 rpm2500–3000 rpm2500–3000 rpm

expand_moreLambda sensor design


All Audi gasoline straight-4 1.6 L ALZ engines	Jump type lambda sensor
All other modifications	wideband sensor


Lambda value	0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ

expand_moreMaximum HC content at idling


2.0 with gasoline straight-4 2.0 L 129 HP engine (2004.11–2008.6)	100 ppm100 ppm100 ppm

expand_morePetrol conditioning speed


All Audi gasoline straight-4 1.6 L ALZ engines	2500–3200 rpm2500–3200 rpm2500–3200 rpm
All Audi gasoline straight-4 2.0 L BGB engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BPG engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BUL engines	3800–4500 rpm3800–4500 rpm3800–4500 rpm
All Audi gasoline straight-4 2.0 L BWE engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All Audi gasoline straight-4 2.0 L BWT engines	3000–3500 rpm3000–3500 rpm3000–3500 rpm
All other modifications	2500–3000 rpm2500–3000 rpm2500–3000 rpm


Petrol conditioning time	120 s120 s120 s

expand_moreTest speed for lambda sensor signal


All Audi gasoline straight-4 2.0 L ALT engines	700–960 rpm700–960 rpm700–960 rpm
All Audi gasoline straight-4 1.6 L ALZ engines	700–960 rpm700–960 rpm700–960 rpm
All Audi gasoline V6 3.0 L BBJ engines	680–800 rpm680–800 rpm680–800 rpm

expand_moreVoltage swing at test speed


1.6 with gasoline straight-4 1.6 L 101 HP engine (2004.11–2008.6)	0.3 V0.3 V0.3 V
More than

To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Audi.

Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2005 Audi A4 user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.

Before doing any DIY service please check your insurance policy and Audi warranty policy for your region. In some regions DIY service may invalidate your warranty.

Maintenance Items

Service Intervals

Conquer your fears and never give up!

DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi A4 service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.

Doing basic service for your 2005 Audi A4 you're not only saving money, but also also improving your technical skills and learning something new.

2005 Audi A4 B7 Emission

Table of Contents

Conquer your fears and never give up!

Audi A4 B7 model years

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