WebApr 23, 2009 · P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) So I threw a P0421 code on my cp-e catted downpipe...this is actually the 3rd time it has happened now....past few weeks I have been throwing it and I just erase the code with my Equus DTC reader...but it keeps coming back after a few hundred miles What do you guys think it is? WebJul 4, 2024 · Code P0420 stands for “Catalyst System Efficiency Below Threshold (Bank 1).” Put simply, this code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter.The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter.
P0421: Warm Up Catalyst Efficiency Below Threshold (Bank 1)
WebJan 28, 2024 · The P0421 code is a catalytic converter is failing code. It is one of only a few diagnostic codes that points directly to the source of the problem. It has nothing to do with spark plugs, MAF, etc. A tune up can help reduce tailpipe emissions, but won't fix this code. Don't read too much into the "warm-up" portion of the code. WebWas does system too lean bank 1 and bank 2 mean? Read More . Trouble Code P0451: EVAP Emission System Pressure Sensor Performance. Learn what Trouble Code P0451 means, the cause, and how to fix it. ... Diagnostic Code P0421: Warm Up Catalyst Efficiency Below Threshold. Learn what Trouble Code P0421 means and what to do next. Read More … ferrous sulfate every other day
How to Fix Catalytic Converter Codes p0421, p0431 Audi A4 B6 3.0
WebSep 20, 2010 · The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days. CausesA code P0421 may mean that one or more of the following has happened: *The catalytic converter is no longer functioning properly. *An oxygen sensor is not reading (functioning) properly. *A sparkplug is fouled up. WebDTC P0421, sometimes indicated as P042100 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing warm up catalyst efficiency below threshold (bank 1). WebJan 3, 2012 · I went immediately to AutoZone and they found the following codes: P0102 (MAP (Man. Absolute pressure)/BARO or MAF (Mass Air Flow) / VAF (Vane Air Flow) sensor condition. P0172 (Fuel Trim Bank 1 condition) P0175 (Fuel Trim Bank 2 condition) P0420 (Catalyst efficiency low-bank 1) I called Audi because I thought it could be something to … ferrous sulfate fda package insert