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P0172, P0301, P0302, and P0303


TNT

New Member
Joined
Jan 1, 2022
Messages
1
City
Utah
Vehicle Year
2002
Transmission
Automatic
I have 4 codes. What's the problem?

P0172 - System to Rich, Bank 1
P0301, P0302, and P0303 - misfires cylinders 1, 2, and 3.

-TNT
 
Welcome to TRS and Happy New Year to you too.
 
Study plugs and wires ..might just need a Change...and do a compression test....and injector cleaned and tested.
 
I've seen the timing chain tensioner go bad and cause all of these codes too, considering it's an entire bank, it's quite possible
 
...4 codes. What's the problem?
...P0172 - System to Rich, Bank 1
...P0301, P0302, and P0303 - misfires cylinders 1, 2, and 3.
Assuming V6~4.0L~SOHC, your profile\signature\thread aint saying?
Could be several things; notorious items are
~ Cracked\Leaking PCV HoseElbow on assembly running from right side of IntakeManifoldThroat to PCVValve@ rear of left ValveCover
~ Bad upstream right Bank1 OxygenSensor (how old are your sensors?)
~ Bad CoilPack, Bad\Mixed Wires, how old is CoilPack+Wires?
~ Bad Plugs, not likely with all 3 cylinder misfires, how old are your plugs?
~ Leaking IntakeManifold Gasket
~ Bad FuelInjectors, not likely with all 3 right cylinder misfires
~ Bad MAFSensor\Wiring
~ Bad IACValve

I'd first suspect something specific to right side: OxygenSensor11, CoilPack\Wires\Plugs...
 
Last edited:

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