massred98gt

hey guys my car has been running like crap for quite some time now with a slight stumble at cruizing speeds and horrible gas mileage. so i took my tune off yesterday and returned the car to stock tune and my check engine light popped up. i was pumped lol so i pulled the codes and the p01360 (low bank 1 sensor 2 voltage) and p1000 (system check incomplete) my question is which o2 sensor is bank 1 sensor 2? and what could cause and incomplete system check??? i'm pretty sure that the bank 1 sensor's are on the number one cylinder side, but im just trying to make sure. thanks guys

WhiteFoxGT

Thats the passenger side rear 02 sensor...could be from the high flow cats. Rear 02s do nothing but monitor the cats .... shouldnt cause a driveability problem

massred98gt

so a rear o2 sensor wouldn't cause driveability issues???? well when the upstream o2 sensor's detect low voltage doesn't that mean that its lean? when the rear o2 sensors detect this does it mean something else?

MikeInCape

Rear O2 sensors only do emissions. Your car does not monitor them in any way that effects your drivability. But it will throw a code, to let you know your emissions will fail.

Have you done a tuneup recently? Have you checked that all plug wires are clipped in all the way? Any plug wires been burned by your headers? Change your fuel filter lately? <-Those types of things are likely the cause.

massred98gt

if you mean recently as in last summer, then yes. I did alot of work to my car last summer and everthing that i put in was new, fuel filter, plugs, wires, ect. damn i was hoping the rear o2 could have been the culperate, but what else would cause this stumbling and poor gas mileage. i've cleaned the maf, filter, i have no vacuum leaks. do u guys have any other ideas.

also, what would cause my car to through a p1000 code???

cliffyk

Stumbling and poor fuel economy could be aging front O2 sensors, as the get old their response time slows and the output drops--telling the PCM the mix is lean.

This can happen without throwing any DTCs if they are still switching within the acceptable range. The PCM compensates for the overall lower output by adding fuel (poor economy), and because of the slow response causes bogging (which could be perceived as a stumble).

At lighter loads and lower engine speeds the feedback they are providing in closed loop mode is out of time with decisions the PCM is making.

MikeInCape

P1000 Just means you reset your codes (turned off the check engine light) recently.