Question about 1999 Mazda MX-5 Miata

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What does the code PO455 mean?

Code PO455 came on with check engine light, local auto parts place said that it is the fuel cap it probably was not closed correctly. Tank is 1/8 full, meaning the gas cap was opened five days ago. What else can it be? Is it something I can trace and replace or repair myself? I am a driveway mechanic, no formal training. Did better in earlier cars with no computerized stuff.

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PO455 Evap System Gross Leak

The old days left in 1981 some 32 years ago

You really have to smoke test the Evap System to
find hose leaks & use a scan tool to actuate the solenoids
to check for bad ones

Without a system diagram your pretty much lost

Posted on Nov 27, 2012

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SOURCE: check engine light came on

CODE PO455 IS EVAP SYSTEM LARGE LEAK 0.080 DETECTED. POSSIBLE CAUSES FUEL FILLER CAP LOOSE CROSS THREADED OR INCORRECT PART. PURGE SOLENOID VALVE IS DAMAGED OR HAS FAILED. CHARCOAL CANISTER IS LOADED WITH FUEL OR MOISTURE OR HAS FAILED. CANISTER DRAIN CUT VALVE CDCV IS DAMAGED OR LEAKING. FUEL TANK PRESSURE FTP SENSOR IS DAMAGED OR HAS FAILED. CATCH TANK OR ROLLOVER VALVE IS DAMAGED OR FUEL TANK IS LEAKING.VAPOR LINES DAMAGED OR LEAKING BETWEEN THE PURGE SOLENOID AND INTAKE MANIFOLD , PURGE SOLENOID AND CANISTER OR BETWEEN THE PRESSURE CONTROL VALVE, CHECK VALVE AND ROLLOVER VALVE. PCM HAS FAILED.

Posted on May 06, 2011

  • 1341 Answers

SOURCE: 2004 Mazda RX-8 PO455

It will not go off by itself,you will need to reset it by connecting to a diagnostic tool.Once cleared if there is any other problem then it will trigger the check engine light again.Hope this helps..

Posted on Sep 03, 2009

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1 Answer

What does this code mean po455


Leak in evaporative emission control system. Good place to start is to remove gas cap and clean, re-install and make sure it's tight. Erase code and see if it returns. Especially if check light came on soon after getting fuel.

Jul 24, 2014 | 2002 Dodge Neon

1 Answer

What can i do po455 code


P0455 CHEVROLET - Evaporative Emission Control System Leak Detected Gross Leak3xicon.jpghttp://engine-codes.com/p0455_chevrolet.htmlForum CodePossible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

Jun 24, 2012 | Chevrolet Silverado 1500 Cars & Trucks

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What is code PO496 and PO455 for a 2007 Pontiac Grand Prix mean


P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

Jan 24, 2012 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

DTC CODE PO455 2000 BEETLE WITH 38,000 MILES


Hi.

The DTC PO455 means "Evaporative System Emission Leak". The evaporative system is where gases evaporating from tank are collected and directed to the engine where they get mixed with fuel from pump and air.

P0455 is often caused by a defective fuel cap. The fuel system in your Beetle is pressurized. If the cap is defective it will allow gases and air out triggering the code.

Change the cap first.

If the fuel cap does not fix the problem then there is effectively a leak. That is usually caused by a broken evap system hose. In that case the parts in the evaporative system must be tested. The repair should not be expensive.

Regards.

Ginko

Aug 09, 2011 | 2000 Volkswagen Beetle

1 Answer

Check engine light came on while I was driving back from LA. had a lube and oil change and the mechanic said my code was PO455. light is off now but what did it mean? low oil? etc? thanks.


CODE PO455 IS EVAP SYSTEM LARGE LEAK 0.080 DETECTED. POSSIBLE CAUSES FUEL FILLER CAP LOOSE CROSS THREADED OR INCORRECT PART. PURGE SOLENOID VALVE IS DAMAGED OR HAS FAILED. CHARCOAL CANISTER IS LOADED WITH FUEL OR MOISTURE OR HAS FAILED. CANISTER DRAIN CUT VALVE CDCV IS DAMAGED OR LEAKING. FUEL TANK PRESSURE FTP SENSOR IS DAMAGED OR HAS FAILED. CATCH TANK OR ROLLOVER VALVE IS DAMAGED OR FUEL TANK IS LEAKING.VAPOR LINES DAMAGED OR LEAKING BETWEEN THE PURGE SOLENOID AND INTAKE MANIFOLD , PURGE SOLENOID AND CANISTER OR BETWEEN THE PRESSURE CONTROL VALVE, CHECK VALVE AND ROLLOVER VALVE. PCM HAS FAILED.

May 06, 2011 | Mazda MAZDA3 Cars & Trucks

2 Answers

Emission test coe PO455


The missing ABS fuse will not set this code as ABS is not part of the emissions system. This code is caused by a leak in the EVAP system. Replacing the fuel cap is probably the cheapest solution if you're lucky. Very rarely will the cap be bad. You'll need to check the entire EVAP system for leaks, loose connections, bad hoses etc. The main problem that will trip this code is the EVAP control solenoid. If after checking the system you find no bad hoses or other obvious leaks you'll need to replace the EVAP solenoid.

The solenoid is located under the car behind the fuel tank on the rear cross member. It looks like a little black boc with an electrical connector and two hoses coming from it. Good luck.

Jun 07, 2010 | 2006 Suzuki Forenza

3 Answers

What does diagnostic code PO455


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.

Sep 29, 2009 | 2003 Hummer H2

1 Answer

2004 Mazda RX-8 PO455


It will not go off by itself,you will need to reset it by connecting to a diagnostic tool.Once cleared if there is any other problem then it will trigger the check engine light again.Hope this helps..

Sep 03, 2009 | 2004 Mazda RX-8

3 Answers

The check engine light keeps coming on -we were told it was because gas cap was loose-but she filled up & tightened the cap-but still on


First, you need to go to a local parts store and find out what the code means. If it shows a small leak, the gas cap probably needs replaced. Gas caps need replaced more often now that computers register fuel emissions.

Jul 01, 2009 | 2006 Suzuki Grand Vitara

1 Answer

Check engine light comes on


"po455 large leak" means that you are not maintaining positive pressure in your fuel system. Have a mechanic do a "smoke test" on the fuel system. Could be as simple as a loose gas cap...

Jun 01, 2009 | 2001 Dodge Durango

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