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2008 hyundai accent runs rough P0420 code
co0de p 0420 refers to vat converter bank 1 below threshold ===causes ---cat converter---wiring ---HO2S ( heated oxygen sensor in the exhaust manifold bank 1 before the cat converter) you have possible 2 problems
1--- the HO2S is faulty but that alone will not result in what you describe
It's function is to read the exhaust gas composition out of the combustion chamber and report to the ECM so that the air fuel ratio can be maintained according to set parameters
the most likely problem is a failed cat converter that is blocking the exhaust system
with the exhaust not flowing freely, there is excessive back pressure and that stops the exhaust gas from exiting the combustion chambers and so rpm is restricted and the economy takes a nose dive
I would consider that you have the cat tested and /or replaced as that will be the base fault causing the problems
on Oct 27, 2017
I HAVE ACCENT 2008 MY ENGINE DOES NOT WORKING
when washing an engine you have to be careful any seal on the electrics can be weak and water can get in this will disrupt the signals the ecu uses. you will need to remove one by one every sensor cap were the wiring goes in and check there is no water in them, even the ecu connection, any water found dry out and replace the seal as its weak, you have to be careful when washing engines they don't get that wet in normal running, i usually steam clean the engine bay as this does not use excessive amounts of water and removes oil and grease better than water on it own.
on Jul 03, 2017
Strong gas smell inside and
On my 2002 I had the same problem and was caused by the evap system (emissions). The module is located in the back of the car, tucked up right by the back fender-pannel by the fuel filler tube.
on Dec 13, 2016
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