Question about Cars & Trucks
P0422 code after having replaced both O2 sensors
Posted by Anonymous on
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Posted on Jan 02, 2017
A good start would be to go you the Diagnostic Trouble Codes list at http://www.bentleypublishers.com/tech/vw/vw.dtc.table.htm
The DTC's, also known as fault codes, may have other meanings but the list above should point you in the right direction.
Hope this helps - if so a rating would be really appreciated. If is doesn't then "add a comment" instead and I will try to help you further.
Posted on Jul 04, 2008
First of all, these codes are what are called "Powertrain Trouble Codes' (that's what the "P" means P=Powertrain). TCM Request (Transmission Control Module = TCM). The request was to turn on the 'Check Engine" light.
P0720 - output speed sensor circuit malfunction
P0715 - Input speed sensor (turbin speed) circuit malfunction
P0442 - Evaporative Emission System Leak (Small Leak)
P0455 - Evaporative Emission System Leak (Large Leak)
Check fuel filler cap problems - for Evap Emiss leaks
Replace the pulse generators & have the trans fluid replaced/flushed.
The Main Catalyst System Efficiency Bank 1 Is P0420, not P0442
If you had P0420 code, the catalytic converter is shot... and that's an expensive component.
Posted on Oct 18, 2009
You need to check two things.
First, there is a heat shield on top of the front of the motor where the o2 sensor you already replaced is. It's got (4) 12mm bolts. Remove it and check the exhaust manifold (big thing you put the o2 sensor into) for cracks. If there are any cracks, you'll get o2 sensor codes. Replace the manifold.
Second, if the manifold is fine start the car and listen to the exhaust pipe under the engine for leaks. Or if you already know the exhaust is loud... that's gonna do it too. A leaking exhaust pipe on an Accent will set secondary o2 sensor codes.
SHOULD you try to change it yourself, you will need a 7/8" wrench, and a new o2 sensor, or flex pipe, or manifold depending on what's broke. Do NOT touch the tip of the new or old o2 sensor to ANYTHING when you take it out or install it or it will be ruined permanently. Run the car until it's at it's normal operating temperature. Raise the vehicle, and take the o2 sensor out of the car (see below to understand which one) using the 7/8" wrench or if you got fancy and bought an 02 sensor tool... use it.
Replace whatever parts are bad (manifold or pipe) or just replace the sensor you need. Then restart the car and take it to a parts store and have them clear the code. The code (and check engine light) won't return right away, it usually takes a few days. If you did everything right you should be good. If not, it's not a terribly expensive job to have done and by now you should be able to explain to them what's wrong based on what you found when you looked at the car. Just tell them everything you checked and what you saw.
Education: I'm not sure where that half baked answer about o2 sensor 1 being near cylinder one came from but here's the real deal.
Sensor 1 is always BEFORE the catalytic converter
Sensor 2 is always AFTER the catalytic converter
Bank 1 and Bank 2 refer to which SIDE of the exhaust on 6 and 8 cylinder engines. Bank 1 is usually left side, Bank 2 is usually right side.
So... O2 sensor B1S1 refers to the O2 sensor BEFORE the converter on the LEFT side of the motor.
Posted on Nov 23, 2009
SOURCE: 1996 spotage kia p0422
P0422 Main Catalyst Efficlency Below Threshold (Bank 1) The catalyst’s efficiency is demonstrated by its ability to oxidize CO and hydrocarbon emissions. The Engine Control Module (ECM) compares the output signals of the front and rear oxygen sensors to determine whether the output of the rear sensor is beginning to match the output of the front oxygen sensor. Air/fuel mixture compensation keeps the frequency of the front oxygen sensor high due to the changes from rich-to-lean comvustio. The catalyst causes the rear oxygen sensor to have a lower frequency. As the catalyst wears, the rear oxygen sensor’s signal trace begins to match the front oxygen sensor’s signal trace. That is because the catalyst becomes saturated with oxygen and cannot use the oxygen to convert hydrocarbon and CO into H₂O and CO₂ with the same efficiency as when it was new. A completely worn catalyst shows a 100% match between the frequency of the front and rear sensors. The ECM sets P0422 if the average of caculated oscillation size of rear HO2S value is higher than threshold value during predetermined time.
Posted on Apr 30, 2010
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