ENGINE LIGHT ON FAILED EMISSION

Could also be a fuel injector problem. Code 300 is for a random miss and 302 is for cylinder two. But it does not mean the cylinder has no spark, just that it is not producing power.

is that a real code ??????????????????? your OBD or check engine light or (MFI) being on means you nee a code reader to decifer codes why you failed emission test . wright back with code and someone here will help you get your answers.

check engine light ison,autozone says code is P0449 this is whattheir ticket says:

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Definition:
EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

Explanation:
The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connevtor and wiring
3- Fuel saturated vapor canister
4- Failed EVAP vent solenoid

yes, the engine light on means your car has the obd2 code problem, you need a scan tool to check out the code, and I know this tool can help you car. or you can take your car to the local dealer to diagnose the code.

P0057 Definition: O2 Sensor heater circuit low- 22
Probable causes:
1. Open or short circuit condition
2. Open fuse
3. Failed HO2S 11 (i.e., bad O2 Sensor).

Got this off the Jaguar Forums.com for you.

2004 Honda Pilot engine light came on this morning. Last bought gas 5 days ago. Auto Zone checked and found code P1456, emission control system leak detected (fuel tank system)
Four options;
1) Loose fuel cap
2) Vapor canister saturated
3) Failed vent solanoid
4) Failed purge solenoid

Thanks.

the check engine light comes on when 1 of about 200 separate faults has occurred in the electronic engine and emission control systems, when the light is on there is a fault code for the failed system stored in the computers memory, Kragen and Autozone and others do this test for free, ask for a OBD 2 fault code test or just say you have a checke engine light and need a test.

po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

Change thermostat and temp sensor....do another drive cycle....Plug your scanner back in and see if all the monitors are finished their tests...If not find out which monitor is still running...