Is this related? [Archive] - Forum


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09-27-2010, 07:24 AM
Hello everyone. Yesterday when I was driving on the highway i felt something of a surge in power. When I got off the highway the idle on the car was jumping from almost a stall to 1600rpms. Now all of a sudden the car will not drop into overdrive. All the other gears a fine no slipping clean crisp shifts even under heavy loads. Is one some how related to the other. No codes in the ecu.

Thank you.


Edit... Today Codes po131 and p0171. Egr??????? Tranny was shifting normal today over a 100km trip. Idle was still the same. cleared the codes several times same 2 returned.

09-28-2010, 07:06 AM
Can you guys help me with the codes. From what I have read the egr valve could be culprit. Ideas ???

Thank you.


09-28-2010, 07:13 AM
Just off memory, I think p0171 is related to the MAF, try cleaning it.

09-28-2010, 07:14 AM
P0131 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0171 - System too Lean

09-28-2010, 08:18 AM
Thank for the breakdown of the codes guys. The reader that I have does give me the exact description of the code.

I am looking for advise on how to repair and if anybody would recomend something. I have read a lot about it in the last couple days and a EGR valve seems to be a possibility. What do you all think?

P0131 is the bank 1 o2 sensor code which I am assuming is because its is sensing to much oxygen in the exhaust. ???.

P0171 is too lean code. I am assuming it is running lean because or to do with the first code.

I just do not want to throw a bunch of different parts if a can narrow it to one.

Thank you.


09-28-2010, 08:22 AM
These cars only have two 02 sensors, the main one in the back part of the exhaust manifold, and the one after the cat (which just monitors the cat, doesn't affect the AFR)

Assuming the car is high in mileage, I'd just swap out the sensor. A bad 02 sensor could set off a lean code since the 02 sensor isn't working correctly, and the PCM is trying to adjust for it too greatly.

09-28-2010, 08:43 AM
Choas. Do you think a bad o2 sensor would be causing my idle issue that was described in my original post?

Thank you


09-28-2010, 08:51 AM
The main 02 sensor regulates the AFR, so it can if the sensor is not working right.

09-28-2010, 08:59 AM
or a vaccum leak o2 sensors are kinda few and far yeah the dude at autozone sells the **** out of o2 sensors but yeah we all have a bad story about autozone

09-28-2010, 08:55 PM
autozone = 65$ for sensor.....can always return

09-30-2010, 06:39 PM

Changed the bank one o2 sensor tonight. Seems to have fixed all associated issues with the car. Over the last two days I was constantly getting the two above mentioned codes plus a random misfire code. I kept clearing them but they kept logging in the ecu.

Dont ask me why but when I would get the misfire code is when I would lose overdrive. Yes I know our cars 4 gears plus that extra little drop as in 1800rpm at 100kph. When that misfire code appeared is when I would lose that little drop in 4th. Now at 2100rpm. Clear codes while I was in motion and as soon as I would hit erase boom the 4th gear over drive would kick down.

Idle is sitting smoothly at 650rpm now.

Thank you for the help. Maybe this write up will help somebody else.