Landed a bit hard - now check engine light is on.

[TerryMason]

I did some offroading last weekend, and got in a bit of mud. At one point I had built up some speed (we'll call it momentum), and plowed through some of the thick stuff. The front end popped up a bit, and I came down pretty hard - at that exact time the check engine light came one.

It's been two days, and the light is still on. My code reader gives me code P0057. It appears to be an O2 Sensor, but i can't for the life of me figure out which one of the four.

I've looked around, and can't find any broken or loose connection - could the impact have broken the O2 sensor, or is it likely something else?


----------------------

SYMPTOM
P0057-O2 SENSOR 2/2 HEATER CIRCUIT LOW


TEST NOTE
This symptom is diagnosed using the test P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.


WHEN MONITORED
Battery voltage above 10.6 volts , ASD is powered up, and O2 heater is on.


SET CONDITION
O2 Heater element input is below the minimum acceptable voltage.


POSSIBLE CAUSES




O2 Sensor heater operation
O2 Heater element
O2 Heater control circuit
O2 Heater control shorted to ground
PCM

 

[jps4jeep]

Could be, have the code cleared and see if it returns. If so just replace the O2.

Honestly I am more leaning toward drastic temp variables being a potential cause. On the throttle, heat soaking the O2's electrode than submerging in cool mud quickly cooling followed by another heat soaking.

 

[JPNinPA]

^^ I'm with him on this.


MUD<=>DUM

 

[TerryMason]

It didn't look that deep...

 

[SteelHeadz]

I agree. If the DTC comes back, it's best to replace both upstream and downstream sensors if all of them are of the same age. One of the sensors might have received enough impact to damage the element internal to the sensors. My bet would be one or both of the downstream sensors.

Sent from my iPad using Jeepz

 

[carnuck]

You can download a program to your laptop that you can plug into the OBD port and read "real time" what's going on. A buddy has it but I don't recall the cost. It was cheaper than a Snap On MT2500 though.

 

[Jeeprancher]

Updates ?