Question about 2004 GMC Envoy

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PO 455 and PO 128 codes. What is wrong with my truck?

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P0455 is indicating a leak in the Evaporative Emissions system, a common reason for this is a loose gas cap.
P0128 is indicating that the engine is not coming up to operating temperature, a common reason for this is a stuck open thermostat.

Posted on Oct 23, 2010

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1 Answer

Po 420 ?


Why would you change any items?

Have you not googled the code?

420 & 430 are exhaust converter issues

You change no parts,you check for codes & component
test system faults using the codes, until you find a problem

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1 Answer

Po codes


Almost all codes, generic anyway, can be found using Google
OBD PO !!!
Code won't tell you what is wrong ,or to replace anything
Just a sensor out of range, that has to be tested or wiring
issue,depends on the code

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2000 Honda Accord po-7*** errors


You can't fix these types of complex electronic engine control problems without special equipment.

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Code number for o2 sensor voltage low


Forget to write it down?

Generic or Manufacturer?

There are 41 Generic O2 Codes

PO 131--bank 1 sensor 1
PO 137--bank1 sensor 2
PO 143--bank1 sensor 3
PO 151--bank2 sensor 1
PO 157--bank1 sensor2
PO 163--bank2 sensor 3

Nov 23, 2012 | 2009 Toyota RAV4

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My 2000 saturns engine light came on i got codes po 341 po122 po340 po 107 po706po714po 731


my engine light also came on one day and I got the same, its common in older cars for this light to stay on all the time, you can truble shoot this by spending money on each of the engine sinsors, but i have had this light on for over 5 years and nothing is wrong with my car

Jul 31, 2012 | 2000 Saturn SL

1 Answer

Engine light on


You need to read the computer fault code to determine why. Take the car to any auto parts store (O'Reilly, Autozone, Napa, etc.). They will read it for you for free. They will give you a code that starts with PO something. Ex: PO435, PO317, etc. The code can then be translated to what is wrong with your Camry. It only take a copule minutes to read the code. They should also have the chart that tells you what the PO code means (what's wrong).

May 13, 2010 | 2001 Toyota Camry Solara

2 Answers

My engine light came on


Trouble Code: P0455


EVAP Large Leak Detected

Possible Causes:


EVAP purge solenoid is damaged or it has failed

Fuel tank cap is damaged, missing or the wrong part number.(Check the fuel cap). replace if not the factory type.

NVLD switch is damaged or it has failed

Jul 14, 2009 | 2000 Nissan Xterra

1 Answer

What is a 112 and a 444 code on my hyundai santa fe


Code PO 112 is intake air temperature circuit low input and PO 444 is Evaporative Emission control system purge contol valve circuit open. Both codes could be sensor problems or wiring problems.

Mar 11, 2009 | 2001 Hyundai Santa Fe

1 Answer

Check engine light on


P0700 - Transmission Control System Malfunction, this is a transmission or PCM issue and needs further diagnosis with other test gear.

The P1684 code simply means that the battery has been disconneted within the last 50 engine starts.

Sep 09, 2008 | 2001 Dodge Caravan

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