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I have 2003 grand am and I would like to know what these codes mean po420 po440 po420pd po440pd

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  • 75 Answers

Call the dealer or look it up on the internet. I know o reilys has code readers.

Posted on Apr 16, 2014

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SOURCE: 1997 toyota camry check engine light on,code po440,po420,po441,

P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Posted on Mar 29, 2009

polarcycle
  • 1392 Answers

SOURCE: I need to know what part needed for a Po440 Code?

Most likely not a part. Make sure your vacuum supply to your leak detection pump is not disconnected. This is the cause 9 out of 10 times. If not, check for power and ground to the LDP, or the purge valve.

Posted on May 29, 2009

  • 1608 Answers

SOURCE: 1998 grand am 2.4 liter, engine code po420 (twc

What this means is that the three way catalytic converter is not doing it`s job and it needs to be replaced.First check the exhaust system and make sure it is not bent or has holes.If it`s good then make sure the rear o2 sensor is working properly.If that`s good the you will have to replace the cat.converter.Good luck.

Posted on Dec 06, 2009

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SOURCE: need to know what PO440, PO441, and PO446 codes

p0440 is the evaporative emission control system p0441 is incorrect evap purge flow and p0446 is evap vent control circuit this means the charcaol canister is defective the only problem is they are in the rear of the car above the gas tank and they are metal when you gas up your car there are warning signs DO NOT TOP OFF TANK meaning when gas pump shuts off do not put in more gas ! reason being is the gas overflows into the metal canister and gets trapped and absorbs moisture , and you know what water does to metal .... rust ! no signal to solenoid = check engine light and codes sorry to say you are looking at about 600-700 dollars to fix

Posted on Aug 04, 2010

rabbit7954
  • 417 Answers

SOURCE: trouble code PO420

catalyst system running below threshold. It means you have a catalytic converter problem.

Posted on Jul 23, 2012

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Pontiac grand am I had a diagnostic reading at autozone for diagnostic codes po128,po440 and p1189 don't know what they mean for a 2003 Pontiac grand am gt 3.4 liter and v6 engine vehical


PO128 -- engine coolant low or thermostat not working
P0440 - EVAP system malfunction, gas cap loose - Cat convertors missing from car can cause this
P1189 - Engine Oil Pressure Switch Circuit -- CAT CONVERTORS MISSING FROM CAR can cause this.

Jan 28, 2015 | 2003 Pontiac Grand Am

1 Answer

What is codes po128 ,po440 and p1189 for a 2003 ponyiac grand am gt 3.4 liter and v6 engune?


Oil pressure switch issue
Coolant temperature sensor issue
EVAP system issue
All different issues, so I suggest seeing a mechanic.

Jan 28, 2015 | 2003 Pontiac Grand Am

1 Answer

My 02 camry le failed emmission test whats wrong error codes po440, po441, po446, po420


You have codes for a failed exhaust converter,PO420,
EVAP System problem PO440,Incorrect Purge Flow PO441,
Evap Vent Control issues,PO446

Your car is all messed up

That should have been all checked, BEFORE you spent time
in line for inspection

If all the codes are for real & not a false report

You will need new spark plugs,ignition & fuel checked,
new exhaust converters,new evap purge valve,new evap
vent solenoid & possibly vacuum leaks resolved

You either bought someones neglected vehicle or never
do a thing but drive it

May be easier to get a different vehicle,your repair bill
will start at $1,000 & go up, from not being proactive & taking
care of what is required in owning any vehicle (lack of knowledge)

You will need the oxygen sensors also & no, they won't fix the
amount, of what appears to be several failed items, all at one time

So much for Toyota being better than other vehicles

Apr 03, 2013 | 2002 Toyota Camry

1 Answer

My problem is with my 2002 toyota celical the check engine light is on and got these codes po420 po442 and po440


http://www.obd-codes.com you can check your codes here and some info on these codes

Feb 20, 2013 | 2002 Toyota Celica

1 Answer

My 2003 Lincoln Aviator emissions light is on and I failed inspection because of it. How can I pass inspection and fix this emissions problem? The inspection code given to me was PO420???


po420 is catalyst system efficiency below threshold. meaning is--- could be down stream 02 sensors or a bad convertor. try buy replacing down stream sensors, hopefully this may help. ( down stream 02 sensors are between convertor and tailpipe). have a good day !!

Dec 13, 2010 | 2003 Lincoln Aviator

1 Answer

I need to know what part needed for a Po440 Code?


Most likely not a part. Make sure your vacuum supply to your leak detection pump is not disconnected. This is the cause 9 out of 10 times. If not, check for power and ground to the LDP, or the purge valve.

May 29, 2009 | 2003 Dodge Dakota Club Cab

1 Answer

1997 toyota camry check engine light on,code po440,po420,po441,


P0420 is catalyst system efficiency below threshold (bank 1)

P0440 is evaporative emission control system malfunction

P0441 is evaporative emission control system incorrect purge flow

Mar 29, 2009 | 1997 Toyota Camry

1 Answer

The code PO420 came on for my 2000 Toyota Camray ......


Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Feb 02, 2009 | 2003 Toyota Corolla

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