Question about 2001 BMW 5 Series

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My service engine light went on and brought codes P0492 & P0493 . I was told it was the secondary air injection system. I brought the car in to have it checked out and they said the secondary air pump needed to be replaced. I have not had it fixed yet because I was told it wasn't urgent, however, now by MPG gauge is malfunctioning and it never did this before. When I begin to approach a stoplight and I am coasting towards the light (not foot on either peddle) the gauge heads towards 40mpg. As soon as I begin to brake it goes to 15MPG and then quickly goes the other way and heads back to 40MPG. I also feel that I am not getting as good of gas mileage. Could this be a direct cause of the air pump?

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I'm not sure if you fixed your problem yet but I had some similar gremlins on my 2001 540. Just a word of advice. Ensure that the tube from the air pump to the manifold is clear. This can occasionally get blocked and this is what causes the air pump to over heat and fail in the first place. after replacing a couple of air pumps, I learned this the hard way.

Posted on Mar 15, 2009

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I have a service engine soon light on and have hooked up an OBD11 reader to it and got code P0410 pertaining to a secondary air injection problem. hoses are fine, pump is new.


P0410 Oldsmobile - Secondary Air Injection System Malfunction

Possible causes: - Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

Tech notes: Visually inspect AIR pump and AIR bypass valve harness and connector, if connector are OK, then replaced AIR bypass valve.

When is the code detected? The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.

Possible symptoms: - Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

P0410 Oldsmobile Description An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.
P0410 Oldsmobile Secondary Air Injection System Malfunction

May 30, 2015 | 2001 Oldsmobile Intrigue

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What is code p0491 and code p0492


these refer to the secondary air intake system , insufficient flow . this could be an electrical fault or a component such as the relay , solenoid etc, follow this link for more info
BMW Secondary Air System Fault Code Diagnosing How To DIY OBD II

Jun 24, 2014 | 2005 BMW 645Ci

1 Answer

I replaced my secondary air check valve on my 2001 chevy tahoe but code 1416 still comes up. what else can i check


here is what i found on p1416.



P1416 Chevrolet
P1416 Chevrolet - Secondary Air Injection System Bank 2
Possible causes
- Faulty Secondary Air Injection (AIR) pump
- Secondary Air Injection check valve bank 2
- Secondary Air Injection (AIR) pump electrical circuit fault
- Blocked Secondary Air Injection (AIR) system

When is the code detected?

The P1416 code is set when no O2 sensor voltage change is detected by the Engine Control Module (ECM).


Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)


P1416 Chevrolet Description
An Secondary Air Injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. The PCM supplies a ground to the AIR pump relay, which energizes the AIR pump. The Powertrain Control Module (PCM) monitors the HO2S voltages to diagnose the AIR system. During the AIR test the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors the HO2S voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.

Jan 23, 2014 | 2001 Chevrolet Tahoe

1 Answer

Code po 491 and po 492


P0491 Secondary Air Injection System (Bank 1)
P0492 Secondary Air Injection System (Bank 2)
Good luck for you!
OBD2 code reader

Jun 25, 2013 | 2001 BMW 330

2 Answers

Check engine light on, diagnostic code 0128 and 0410 keep coming up


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

P0410 - Secondary Air Injection System Malfunction
(has to do with exhaust system)

Note: There is a technical service bulletin (TSB) regarding code P0410 for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Oct 13, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

Code p0412 , what is the fix? 1995 mitsubishi eclipse with a dodge avenger 2.0 engine.


P0412 Pulsed secondary air injection solenoid circuit, with seeing it and what it is doing i would guess replace the secondary air injection solenoid control valve.

Jun 05, 2009 | 1995 Mitsubishi Eclipse

1 Answer

Hazard lights come on anytime they want ????


this is what the code means
P0492
Secondary Air Injection System (Bank 2)

May 29, 2009 | 2003 BMW 325

2 Answers

Secondary Air Pump and MPG Gauge


Fist of all this is a 2009 vehicle and if you are having any problem with a secondary air pump with this NEW vehicle it should be under warranty or should be a recall and should be fixed for FREE, by BMW. This vehicle in my opinion is way too new to be having such problems, that pump must have been defective. I also believe that thier may be other problem going o with this vehicle. MY SUGGESTION IS TO TAKE THIS THING BACK TO BMW ADN HAVE THEM FIX ALL YOUR ISSUES FOR FREE. Good Luckand thanks for using FIX YA

Jan 26, 2009 | 2009 BMW X5

2 Answers

Service engine soon light


Secondary Air Injection System Description
The secondary air injection (AIR) system helps reduce exhaust emissions. The system forces fresh filtered air into the exhaust stream in order to accelerate catalyst operation.
I have had no luck on the location, but it is down low on most GM near the front of car under the hood, it is very big with hoses comming out of it and going to the engine,

Nov 29, 2008 | 2002 Pontiac Grand Prix

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