99 D2 140,000 miles.
P0137-o2 Circuit low voltage (bak 1, sensor 2)
P1170- Lambda sensor aging tv bank 1Drive cycle C:Signal out of range - above maximum / below minimum

have relaced all four o2 sensors, and had ecu looked at and some connections remade. that solved a lot of problems, now im getting these codes... tring not to take it to the dealer

 

When was the last time you have a good old fashioned tune up?
And you know of the MAF problems while running a K&N air filter right?

 

check for vaccum leaks and your pcv

 

didnt know about maf problems with K&n, have yet to do tune up. these codes came up before i put that filter in tho... its only been in like a hundred miles...

 

I am still getting these codes... they came up shortly after a brake job, i know this has nothing to do with brakes, it just seems that after i do anything they come up.
Question is: if I have an exhaust leak, would these codes be related to the exhaust having a leak at the cat.?

 

Have done the Tune -up as part of my 60K service recently with Magnecor wires, new plugs too.... are these codes truly related to MAF? I hate to, but im gonna take it to the Dealer as they did a couple O2 sensors awhile back, and it seems that both these codes are Emissions related, maybe they can solve this mystery for me because they did get me to pass inspection in feb. 09 after having a bunch of Emissions codes come up.
Unless i can get pointed in the right direction here....

 

i have had similar problems. please keep me posted on any changes. ps i have replaced the MAF. Do not replace it unless you get a 3rd gear trans code.

 

Did they change all four O2 sensors or just 2? I would replace the other 2 before I took it into the dealer. P0137 is for the rear drivers side O2 sensor. The dealership should have changed all 4 when they did it.

 

whats is the lambada sensor code all about?

 

Thinks it's just a bad O2 sensor code. I would replace the other 2 old O2 sensors (it's easy) and clear the codes and see it that does it.