OBDII error code P0134

[4xx5]

P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

2001 X5 4.4i 61,000 miles --- repeated P0134 SES light. Resets and comes back after every 3rd start.

Where exactly is bank 1 sensor 1?
Can this O2 sensor be replaced as a DYI job?

Regards,

4xx5

:eek:

[The Cleaner]

pre-cat is bank one, sensor one is farthest from cat.

[Mackskibum]

Cleaner, he has a 4.4. Bank one should be defined as right side i believe.

[joeblackx5]

I am getting two error codes, p0171 and p0174 I have taken to mechanic and he says it is the cat and it needs to be replaced. can anyone help or is anyone familiar with these codes and how much it would cost to fix.


X5 in trouble.

[chubyball]

Swap left to right and right to left see and change?

[joeblackx5]

OBDII Error codes P0171 and P0174? I dont think I can switch these. Anyone have these problems before and can anyone please help?

[Boston X5 4.4]

Some info here..

P0171 OBD-II Trouble Code
Technical DescriptionSystem Too Lean (Bank 1)

What does that mean?Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

SymptomsYou will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

CausesA code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.
Possible SolutionsPossible solutions include:

In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure

[joeblackx5]

Thanks Boston,

What if? lets say I have checked all of these and done all appropriate steps and my service engine light still comes on then what? My service tech is telling me that I might have to replace the cat which will cost me a lot of money. Does this sound right?

[Hal88]

Originally Posted by joeblackx5

I am getting two error codes, p0171 and p0174 I have taken to mechanic and he says it is the cat and it needs to be replaced. can anyone help or is anyone familiar with these codes and how much it would cost to fix.


X5 in trouble.

Check out this thread, it sounds like what you have, take off eng. cover to see if hoses have holes in them. Hopefuly that's causing the codes. Don't panic, easy fix.
http://www.xoutpost.com/x5-e53-forum/...case+vent+hose

[The Cleaner]

Originally Posted by Mackskibum

Cleaner, he has a 4.4. Bank one should be defined as right side i believe.

In that case it's before the cat on the right side,

I just looked it up and it actually shows the left side will be bank one. Whatever the case it's a precat sensor.