Question about 2001 Volkswagen Cabrio

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Every couple of days i get codes P0455 and P1296 (already rescrewed gas cap) - could bad temperature sensor cause both P codes? I don't drive much, commuting vehicle....96K miles, automatic, convertible....what is downside risk to engine?

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I know the 1296 code is as you say, coolant temp sensor G92, but I dont feel that has any relation to the 0455 code, which refers to low evap system pressure. The fuel tank is pressurised to about 3 psi, due to its sealed construction for preventing petrol fumes reaching the outside. If the seals are not intact, the pressure will be zero, and the ecu will report code P0455. Your evap canister in the engine bay may be faulty, choked or has a tube off, or you really do have a fuel leak somewhere. The code refering to the temp sensor is seperate and you may have 2 unrelated faults. It isnt uncommon for a car to lose 2 sensors etc at the same time, or throw 2 unrelated codes. Treat each one as seperate until you know better and trace the source of each independantly.

Wont hurt the engine, its the emission control stuff that is complaining, but you can do no damage from the Evap code.

The engine temp sensor, will either make the temp gauge read wrong, which could be a problem if the motor overheats and the gauge does not indicate this - BAD - or - it will tell the ecu the car is colder than it is, and it will overfuel and idle faster than it should, not too much of a problem in itself.

I would still check out the fuel pipes etc to see if anything is leaking, as that can be very dangerous.

For peace of mind, is there anyone near you that can perform a pressure test on the gas tank?

Posted on Nov 06, 2009

Testimonial: "great feedback...Replaced the sensor,1296 went away, hasnt come back; havent done anything yet with 0455 as car running smoothly, will park 4 winter.."

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A loose gas cap or bad gas cap can cause this ,or filling gas tank while it running .or it could be a small leak in the evap system

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2006 Mazda codes P0455 P2198 P2189 P2187 P2196. Dont know where to start looking for problem. Bought a new gas cap. Trouble starting after I fill the tank but after I get it started the first time no...


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My 2003 doge g caravan shows engine light on. diagnostic code is p0455. I don't know what that code stands for. could you help me so that I can fix on time


A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system
Possible Solutions With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

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Service engine light on, p0455,


Hi,

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P0455 = Evaporative Emission Control System Leak Detected (gross leak)

What does that mean?

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms

You likely won't notice any drivability problems.

Causes

A code P0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

Possible Solutions

With a P0455, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
All the best

Ben

Jun 05, 2011 | 2000 Ford Expedition

2 Answers

Engine code po455


Check this info about P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms: You likely won't notice any drivability problems.

Causes: A code p0455 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions: With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary


Check it and keep us updated.

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1 Answer

2006 kia rio check engine light on and code P0455


A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

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3 Answers

2006 kia rio check engine light on and code P0455


A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system

With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes2.gif, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum2.gif

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1998 volvo failed emissions for trouble codes present: P0172 P0455. What to do now


Code P0172 relates to the engine running too lean.
Code P0455 indicates that a leak has been detected in the Evaporative Emission Control System.

P0455 is most often caused by a a problem with the gas cap. It is either incorrectly installed, damaged or just worn out. Other possible causes are a leak in the EVAP system caused by damage or a loose vacuum line.
To solve this first check your gas cap for any damage or wear. For the EVAP system check under the hood. Listen for any vacuum leaks or for the odor of fuel. Check all the vacuum tubes and hoses for breaks in the line. If you find any repair or replace them.

The cause of P0172 is usually associated with a bad O2 sensor but this is not always the case. The causes could be a vacuum leak, an issue with the Mass Air Flow sensor (MAF) or some type of restriction with the fuel system.
The solutions are to inspect the inspect all vacuum and PCV hoses (which you have already done). Inspect and clean the MAF sensor. I am unsure what type engine you have but this will be located somewhere between the intake manifold, possibly on the large black air intake tube.
Finally check the fuel system for leaks. Also the fuel pressure should be checked. You should also run a good quality fuel injector cleaner through a couple fill ups.
After you have done all the simple tasks, (inspecting the gas cap and inspecting the vacuum line and hose on the EVAP system replacing if needed and the fuel injector cleaner. Get your codes reset and wait to see if they come back. If so I think your next step is to replace the O2 sensor. If this still does not solve the problem you will most likely need a complete engine analysis before you can continue.
If you get to that point you should re-post here with the results of the analysis before spend a large sum of money.
I hope this helps and good luck.





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P0455 is a EVAP system leak detected code check to make sure your gas cap is tight or if you put gas in it while it was running and can set it . First tighten the gas cap then clear the code and drive and see if the code comes back.

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