Question about 1996 Audi A4

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My car dies and it gives codes for egr valve and cat converter how do I tell witch one

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With age of car probly both need replacin--but inspec egr 1st-its common to hav an internal vacuum leak-which stalls car at low speeds----if u change the cat-after market ones dont work

Posted on Feb 17, 2012

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P1130,p1131,p1132,p0402


p 0402 is EGR valve and solenoid problems
that sort of back pressure indicates cat converter is blocking the exhaust system
the rest are o2 and Ho2 sensor problems probably from the faulty cat
one side would be oxygen sensor trying to adjust mixture but unable from cat
fix the cat converter/s and then get a fault code reading
next post include make , model and year and engine type

Jul 24, 2016 | Cars & Trucks

1 Answer

How to fix p0404 and p0420


code p0404 refers to exhaust gas recirculation (EGR) valve position--range/performance problem ===causes --hose leakage/blockage--wiring ---EGR valve/solenoid
code p0420 refers to cat converter system bank 1-efficiency below threshold===causes --cat converter---wiring---HO2S 2

May 31, 2014 | 2007 Dodge Grand Caravan SXT Minivan

2 Answers

EGR Valve keeps blowing out and no power


EGR valve blow-out can be caused by a clogged catalytic converter. A clogged cat. converter will cause pressure to back up in the engine. A test to perform is remove the front oxygen sensor from the exhaust to see if the engine runs better. Removing the oxygen sensor will relieve the pressure if, in fact the cat. converter is clogged. Another cause for EGR blow-out could be that the timing has jumped.The timing can be checked to diagnose this issue.

Mar 28, 2014 | 2003 Mazda Tribute

1 Answer

89 chevy s10 misfires and sputters when i give it gas, dies when i stop. Sometimes it runs fine, but recently it's just been bad. When i rev the engine it can stabilize the idle, but usually die


check fuel pump pressure- fuel filter --air filter --egr valve if carboned up clean or replace and cat converter feel the exhaust if feels restricted may be clogging up

Mar 30, 2013 | Chevrolet Blazer Cars & Trucks

1 Answer

Buick errors 420, 401, 1406


P420 is EGR system malfunction P1406 is EGR pintle position problem be sure and check power and ground before condemning the valve and the P401 is catalyst code i would fix EGR code first clear monitors and run a drive cycle to see if the cat code returned although the egr and catalyst are separate systems an EGR that isn't functioning may cause the emissions levels to be too high for a marginal converter to diffuse resulting in the cat efficiency code

Dec 10, 2012 | Cars & Trucks

1 Answer

96 sonoma running too rich with p1406 code


P1406 EGR Valve Pintle Position Circuit Fault
This code is usually caused by carbon buildup in the EGR valve. The carbon deposits prevent the valve from closing completely.

After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

Hope this helps!

Mar 07, 2012 | 1996 GMC Sonoma

2 Answers

My 2000 Isuzu Trooper needs a catalytic converter.


yes they have 2 cataletic convertors, one each bank
there is EGR codes, but only front O2 sensor codes and fuel trim codes no CAT codes
what were the scanner codes or flash codes i can work with both for helpful info
you can read codes by bridging pins 5 & 6 with ignition in on position engine not running


eb2c10d.jpg

Jul 16, 2008 | 2000 Isuzu Trooper

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