Question about Chevrolet Silverado 1500

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2001 Chevy Silverado 4.8, had code PO442 cleared and drove 52 miles. Catalyst, evap and O2 sensor heater tests not complete. Hit 57 miles and code PO453 fuel evap press. sensor switch high. Fuel pump was replaced 1 yr.ago rechecked elec. conn. OK.Could sensor be faulty or gas cap,hoses. What is most common problem?

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  • Chevrolet Master
  • 6,826 Answers

I would check the evaporator canister and vent hoses ,to make sure they are clear,try driving the vehicle with the gas cap off,just to see if it is a vent problem,if so,start checking the vent hoses to the canister,and I believe there is a pressure sensor on the tank,I would check it also,but most likely a ventalation problem.

Posted on Jun 03, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 03, 2010

    I think on this model there is a vent ,on the tank,also,it could be the problem,auto parts will have a listing for it.

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Ok here I go again. I have a 2006 nissan altima 2.5s. I took it to a shop a few months ago for inspection. It failed. After having it diagnosed they said it was the down stream sensor. The code I was...


Real simple

None of the shops you went to,
know how to diagnose a vehicle

I think your statement about one monitor,
is the evap system ,because they can test
the gas cap,the others have to run clear,
at least in New Jersey

Almost seems like the people that come to this site

Your shop just throw parts at the codes & no testing
to find a problem

If the problems are solved, you don't have to clear the codes

Clearing the MIL Lamp or check engine light, clears all data,
emission monitors,& freeze frame data set at the time fault
codes are set,so you got nothing to work with to find a problem

So never clear fault codes after a repair,let the monitors do their thing

All sensors are aftermarket sensors-so that is nonsense

That should have been a clue to forget that shop

The same companies make sensors for everyone,
new vehicle or used

Vehicle manufactures stamp sheet steel & make bodies
& assemble purchased components only

Nov 03, 2014 | Cars & Trucks

1 Answer

Ok let me start by saying that my 2006 Nissan Altima 2.5 S had a check engine light....it was checked and it came up P0037 bank 1 sensor 2.....and I was told that it was the down stream sensor...I...


You need to find a new shop that can actually diagnose
a vehicles evap system & the emission monitors

You can not do that without professional tools & knowledge

Don't know how many times you need to be told that

The shop you went to isn't doing anything apparently

You have problems to find & resolve & no one else will
give you a different answer, if they even work on vehicles,
or have knowledge of the obd systems & only the pros have
the test equipment needed

Apr 30, 2014 | Cars & Trucks

1 Answer

No no it wasn't because of the O2 sensor that it didn't pass it was a couple of things that came up and the we're Catalyst not ready Monitor Evap not ready Monitor O2 not readyz


You have 8 I/M or Emission Monitors that have to run clear
BEFORE you can go to inspection

Your Catalyst Efficiency comes from the switching comparison
of the front & rear oxygen sensors being out of range

Until you resolve the rear O2 Sensor Heater Issue you won't
know if the cat is good or you have other problems

You need professional scan tool software & a long road test
to even find a problem,then component test,which apparently
wasn't done when they hung the new rear sensor on based on a code

Apr 30, 2014 | Cars & Trucks

1 Answer

Want pass emissions without po431 or po442 getting fixed


You can't. These are codes related to the o2 sensor and the evap circuit, and will be checked every time. You can try clearing the codes, but I suspect they will come right back. Time for a repair.

Mar 31, 2014 | 2001 Dodge Stratus

2 Answers

I tried to get a sticker and failed because it stated that 2 (02)sensors, catalyst and evap were not ready on my 2001 saturn sw2. How do I fix this? I have been over 300 miles and have failed twice.w


It is not something you fix, the system self tests after any time the battery is disconnected or the system reset with a scanner tool. Drive it until it clears, take about 20 miles of mixed driving, idle time, freeway, moderate speeds like in town. Gas tank must be at least 3/4 full for the test to complete. This is known as an OBD2 drive cycle. If you had a check engine light and it comes on again then you did not fix the problem.

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I recently reset the obdII error codes on my 2002 Kia Sedona after replacing the 3 ignition coils and plugs and wires to eliminate a problem with primary and secondary ignition coil circuit. Need to k


Replacing Spark Plugs & Ignition Coils
does not require any clearing of codes

You have 8 monitors on most vehicles

5 Monitors do not run all at one time

If the Catalyst fails when it does run, then you
may have not replaced the front O2 Sensors
at 100,000 or one failed
Have to use professional scan tool to look at data
& see if the I/M Monitors have run

The Evap is the last to run & there is no info avail
as to when it runs, as far as I know

The Evap will run once or twice a week-maybe

The cat should run by 50 miles of driving or a couple
hours run time

From 2002 until now-- I doubt the converter has much life left,
but the monitor will still run.

Look at scan tool misfire on Mode $06,O2 Data,Fuel Trim
and such, after a road test of 25 miles,then component test
anything not as it should be.

If you keep using your code reader to clear DATA- forget the codes,then your monitors,freeze frame & such are gone,thus your current situation.

Feb 28, 2014 | Cars & Trucks

1 Answer

Changed head gasket, now won't start.


I would need to know the actual code numbers to comment, but in general those components would not keep the engine from starting.
Have you checked compression, spark and fuel pressure ?

Jun 09, 2013 | 2001 Chevrolet Cavalier

1 Answer

Need description of obd drive cycle


This is my drive cycle a generic drive cycle i have used many times over the years and it has never failed me most drive cycles are too specific and impossible to adhere to for most drivers follow these steps exactly 1. make sure all codes are cleared and no check engine light is on 2 make sure the fuel level is between 1/4 and 3/4 full (this is part of the enable criteria for the evap monitor to run ) 3 let vehicle set overnight 4 start engine and let idle until the temp gauge is in the middle (this cold start enables the evap monitor and runs the O2 sensor heater test )5 drive vehicle around town avoid the highway stay at below 50 mph and when stoping at lights remove your foot from the gas and coast from around 50 to about 10mph or less if possible this will run the EGR monitor after about 3 to five miles of this proceed to the highway or freeway and travel over 50 but under 70 mph for about 3 to 5 miles this will run the catalyst test provided the O2 monitors passed if they didnt you will have a check engine light on before this point also i do a coast down on exit ramps (no braking) they make great places to get that EGR to run ONCE YOU START THIS PROCEDURE DO NOT KILL THE ENGINE OR SOME OF THE TEST WILL FAIL TO RUN

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1 Answer

Ford explorer sportrac evap and catalyst not ready problem how to fix it?


One possible issue is a faulty thermostat. If the engine is not getting up to normal temp the emissions system will not go into closed loop.
I know its hot in Nevada now so thats just a suggestion.
The O2 sensors have heaters to make the exhaust gas hot quick so that the sensors can work.
Is the check engine light coming on - or is it just that the exhaust gas is not hot enough for the test equipment ?

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1 Answer

Error codes PO135, PO449,PO442


THESE ARE FROM THE GM CODE DEFINITION MANUAL

P0135 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 1
P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0442 - Evaporative Emission (EVAP) System Small Leak Detected

Mar 23, 2009 | 2003 Chevrolet Silverado 1500

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