Question about 2001 BMW 5 Series

1 Answer

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?

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 2 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Have a 01 bmw 325ci had code 0491 and 0492 secondary air insufficient i changed the check valve control switch vacum lines water pump 02 sensors up stream thermostat still get the codes can any one tell me...

Did you check the Vacuum lines to the Secondary air Valve Controls. They may be rotten. Can you do a Smoke test. Replace dry rotted lines with either 3/16 Fuel or Power Steering Hoses if you do not get ORM Vacuum lines/hoses. There are many Vedios on You Tube showing this specific problem solving on German cars. you can check out these,
Secondary Air Injection Systems on German Vehicles E39) 2001 BMW 525i Resolve P0491/P0492 for less than $2.00 in approx 15min. How to Fix and Diagnose BMW P0491 P0492 Secondary Air / Vacuum Leak E36 E46 E39 E53

Aug 28, 2017 | BMW Cars & Trucks

1 Answer

How hard is it to change a smog pump on a 2006 Saturn ion?

smog pump ? There is no such thing . What size engine does your ION have ? 2.0 , 2.2 ,2.4 L Has
secondary air injection system .
Secondary Air Injection Pump P0410 P0411 P0412 P0491 P0492

Mar 19, 2017 | 2006 Saturn ION

1 Answer

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

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

1 Answer

Hi, i just bought a 2003 a4 convertible 3.0 from a audi dealership. when it took possession, it didn't have an owners manual so i was playing with the climate control and somehow must've changed some...

code p 0368 refers to a camshaft position sensor B bank 1 -- circuit high===causes wiring short to positive --CMP sensor--ECM
code p 0492 refers to secondary air injection system bank 2---malfunction===causes wiring---AIR solenoid ---hose connections ---mechanical fault
playing with a climate control setting will not affect those codes so I suspect that you are being given the old run around
find yourself an accredited professional service center that has experience on your make of car and get a proper diagnosis and quote or if you have any sort of used car warranty , take it back and don't let them fool you again as you now have the codes facts

Mar 26, 2017 | Audi A4 Cars & Trucks

1 Answer

Hazard lights come on anytime they want ????

this is what the code means
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

Not finding what you are looking for?
2001 BMW 5 Series Logo

Related Topics:

354 people viewed this question

Ask a Question

Usually answered in minutes!

Top BMW Experts

Anthony Jones
Anthony Jones

Level 2 Expert

128 Answers

Frankie B

Level 2 Expert

65 Answers


Level 2 Expert

254 Answers

Are you a BMW Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides