Question about Cars & Trucks
No, P0128 code is the pcm determining that the engine is taking too long to warm up. Usually caused by a defective thermostat. If the engine is knocking upon first start up, then it may be a "dry start" type of situation. When was the last time the oil has been changed and was it quality oil and filter? Without knowing what type (year, make,model) that the car is , I can't help much more than that.
Posted on Jun 14, 2014
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Posted on Jan 02, 2017
SOURCE: po455 trouble code, seems
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
Test, check it and keep us updated.
Posted on May 25, 2011
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