Service Engine Soon: P1148 & P1168
#1
Service Engine Soon: P1148 & P1168
My Service Engine Soon light came on 2 days ago, and my 2004.5 G35 Sedan currently has ~47k miles on it. Two weeks ago, I did change the oil & rotated my tires, but I can't think of anything else that was recently done to the vehicle. The only mod I have is the MD 5/16 plenum spacer which I installed about 1.5 years ago.
This afternoon, I took the G35 to my local parts shop to scan my car. They actually found 2 codes:
P1148 Closed Loop, Bank 1
P1168 Closed Loop, Bank 2
They think this means that 2 of my 4 oxygen sensors need to be replaced, but couldn't tell which 2. Has anyone gotten these codes before? Any idea what I can expect to pay in parts and labor? Any idea what usually causes o2 sensors to fail?
About 10 mins ago, I went ahead and [successfully] cleared my CEL after checking out Msedanman's Easy Ecu Resetting thread. Was that a bad idea? Is it safe to continue driving around like this, or should I bite the bullet and get to the dealership right away?
Any feedback is greatly appreciated.
This afternoon, I took the G35 to my local parts shop to scan my car. They actually found 2 codes:
P1148 Closed Loop, Bank 1
P1168 Closed Loop, Bank 2
They think this means that 2 of my 4 oxygen sensors need to be replaced, but couldn't tell which 2. Has anyone gotten these codes before? Any idea what I can expect to pay in parts and labor? Any idea what usually causes o2 sensors to fail?
About 10 mins ago, I went ahead and [successfully] cleared my CEL after checking out Msedanman's Easy Ecu Resetting thread. Was that a bad idea? Is it safe to continue driving around like this, or should I bite the bullet and get to the dealership right away?
Any feedback is greatly appreciated.
#2
Closed loop is defined based off throttle position and the runs off of the O2 sensors on the exhaust manifolds.
The post-cat O2 sensors are strictly for emission purposes.
It sounds like you need to replace both of your O2 sensors UPSTREAM - on the headers/exhaust manifolds.
Resetting the ECU will not get rid of the problem and the CEL will return if the sensors do need to be replaced.
The post-cat O2 sensors are strictly for emission purposes.
It sounds like you need to replace both of your O2 sensors UPSTREAM - on the headers/exhaust manifolds.
Resetting the ECU will not get rid of the problem and the CEL will return if the sensors do need to be replaced.
#3
Thanks Tollboothwilley. I searched rockauto for upstream oxygen sensors, but couldn't tell which ones to order:
Any recommendations?
- BOSCH Part # 15730 {OE SmartLink - Universal Fit}
Upstream; 2WD; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
$48.79 - STANDARD MOTOR PRODUCTS Part # SG1405
Upstream Sensor; RWD; 2 Required per Vehicle
$102.99 - BOSCH Part # 15524 {OE Type - Exact Fit}
Upstream; 2WD; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles
$124.79
Any recommendations?
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