Question about 1997 BMW 328

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Check engine light on 1996 328i BMW, scanner codes P1421 & P1423

Des anyone know what these scanner codes mean?

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Go to the link below, type in the code and the difinition of that code comes up in a list as defined by each car maker.

Posted on Jan 30, 2010


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P1423, p1421engine codes

p1423 refers to secondary air injection system --insufficient flow detected causes hose connections---air valve--air pump
p1421 refers to secondary air injection system bank 2 insufficient flow detected. causes-- hose connections---air valve---air pump.

May 19, 2013 | BMW Cars & Trucks

1 Answer

Check engine lamp has ok420,and,p1423 codes

420 is catalyic conventer below treshold- (not hot enough_ most likely melted inside)
p1423- bank 1 low air inject- open line or bad air pump

May 11, 2011 | BMW 318 Cars & Trucks

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I have code P1421 and p1423 i think is related to the secondary air pump, please let me know

code p1423 secondary air injection air system bank 1 insuffient flow detected.

Apr 09, 2011 | 1997 BMW 328

1 Answer

I got codes p0455,p1421,p1423,p0141

code P0455......... Evaporative emission system leak detected ( large leak ) check gas cap

code 1451...........secondary air system leak ( bank 2 ) check for vacuum leak

code 1423...........secondary air system leak ( bank 1 ) check for vacuum leak

code 0141...........02 sensor heater circuit ( bank 1, sensor 2 ) replace 02 sensor

Mar 02, 2011 | 1997 BMW 328

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1998 328i.. Got a 1421 and 1423 code...not sure where to start...

1997 BMW 328I 2.8L Customer Concern: MIL is on with trouble codes P1421 and P1423, for incorrect secondary airflow on both cylinder banks. Tests/Procedures: 1. Perform a functional test of the Air Injection Reaction (AIR) system. Tee a vacuum gauge into the vacuum hose attached to the diverter valve, located on the cylinder head towards the front of the engine.

2. Allow the vehicle to sit over night. Start the engine (cold) while monitoring the amount of vacuum on the gauge at startup. At temperatures from -10 to 40 degrees Celsius, there should be at least 17 inches of vacuum. At the same time, the AIR pump should run and pump a large volume of air into the exhaust. Potential Causes: A.I.R. Pump
Air Pump Relay
Restricted Cylinder Head
Diverter Valve
Tech Tips: These codes are related to a problem detected in the Secondary Air Injection system. Scan tools with BMW software include a feature to command the AIR pump on and off. The pattern failures for these codes are the AIR pumps due to leaks in the diverter valve and moisture or condensation in the AIR pump.

Possible fix but not all items. Just areas to look at:
Confirmed Fix - A.I.R. Pump - A.I.R. Diverter - A.I.R. Pump, Air Injection Reaction Diverter (AIRD) Valve - Air Injection Reaction Diverter (AIRD) Valve - Check Valve, Secondary Air Pump - Diverter Valve Vacuum Lines

Jul 04, 2009 | 1997 BMW 328

1 Answer

Check Engine Light on - codes P1423 P1421

I'm not sure where you got the codes... I have a Peake R5/FCX-3 - nice for diagnostics.

You should look at the various BMW forums out there - bimmerforums is a good one.

From a simple google search - Google is your friend...

I reset the CEL and it returned with just the P1421 and P1423 code. I researched the web and found that on the BMW, this is the secondary air pump for cylinders 1-3 that provides air to the exhaust during warm up. According to others, this may be due to a check valve stuck open or closed. Or, it could also be a leak in the output hose or a vacuum hose to the valves. The vacuum line runs close to the engine causing it to get brittle and crack. This 30 cents hose can cause the valve to stay closed, keeping water in the pump and eventually, corrosion to occur. I'll work on it over the weekend and post my results.


Low vacuum to the check valve. Found the Electric Valve Switch leaking vacuum. PN 11-74-7-537-612 $43.55.

May 27, 2009 | 1997 BMW 328

1 Answer

97' BMW Z3 chk eng light code 1423

code P1423 for a BMW is secondary airflow sytem bank 1, consult your repair manual and you can go from there. I am not up on imports to be honest but I was able to find out what the code means for you. hope it helps.

Oct 07, 2008 | 1997 BMW Z3 Roadster

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