Codes say O2 problems even after both have been changed
Both O2 sensors have been replaced. check engine light on and code says O2 sensor problem. Also replaced MAP sensor. Eating alot of gas. Stalls when clutch pushed in and slowing down to stop. Idles rough. RPMs go up and down when stopped with clutch in. Do know that oil pressure sending unit leaking oil. When battery was disconnected and reconnected it will run great for 4 to 5 miles, then starts running bad.
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Re: codes say O2 problems even after both have been...
The code says there is a problem, it does not say where in the circuit the problem is, it could be the wiring to the sensors, it could be the PCM (powertrain control module) in your case it sounds like an intake manifold vacuum leak.
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"System too lean (bank1)" O2 sensor is giving this error code. There are two O2 sensors one near the engine and one downstream. It could just be an anomaly or the sensor could be going bad. (Bank 1) is the O2 sensor closest to the engine. I had a PT cruiser that constantly gave this code even after replacing both sensors. If the car seems to run fine, clear the code and see if it reappears immediately. If it does then the O2 sensor is probably bad. If it doesn't come back then it was probably an anomaly. I would get this code every 2 or three months on the PT cruiser and would just clear the code to turn the check engine light off as the car ran fine.
EGR port plugged or bad Catylitic Converter perhaps or even a wire burnt on the manifold.
Did you get an aftermarket O2?
A leak in the exhuast system causing poor back pressure.
Is it the same code that came up? Check engine light may be indicating another fault elsewhere... Check all vacuum lines, fuses and wiring prior to replacing any sensor.
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To review, the check engine light will stay on until the problem is fixed and the code or codes are erased. And if the O2 sensor is disconnected the light will stay on for sure. Do you have the trouble codes stored in the computer ? FYI - the cylinders should have over 100psi of compression.
The 1137 OBD2 code is typically an o2 sensor problem as you have indicated, first I would make sure your replacing the correct o2 sensor as there are two (upstream and downstream), although it is possible that a bad o2 sensor could keep your engines fuel injection system from delivering the fuel to your engine, in my experience having a bad sensor typically results in a check engine light and running with a less than optimum fuel air mixture, it does not typically keep your vehicle from starting. If your still getting the 1137 error code after replace the o2 sensor and checking its connecting wires I would start looking for a bigger issue.
if you have an O2 sensor faliure you will have a code for it. in fact youe exterra doesnt have O2 sensors. it has A/F sensor or "air/fuel sensor" if it went bad, than you will have a code for that sensor. What is the code number that you have?? need to start there.
If your O2 sensors are malfunctioning, the main symptom would be that the Check Engine light will come on. On some vehicles, an O2 sensor circuit shorted to ground can cause a no-start problem.
If the "Check Engine" or "Service Engine Soon" light is on and there is a code for the O2 sensors, I would like to also advise you that many O2 sensor codes are not caused by the O2 sensors themselves. In many cases, the O2 sensors are only REPORTING the problem. for example, a code P0171 "Oxygen Sensor Lean" code is rarely ever caused by the O2 sensor. It is usually caused by a vacuum leak or a failed Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or a bad fuel injector. In these cases, repairing the real reason that the engine is running lean will fix the O2 Sensor code without replacing the O2 sensor.
There are several types of O2 Sensor codes. There can be "Lean O2 Sensor" codes, "Rich O2 Sensor" codes, "O2 Sensor Slow Response" codes, or "O2sensor Heater Circuit" codes. The specific code that is being set changes the way you must go about diagnosing and repairing the problem. I will say however, that in about 80% of all the O2 Sensor code problems that I have had to diagnose, the O2 Sensor itself was NOT the problem. The O2 Sensor was only reporting a problem that was actually caused elsewhere. O2 Sensors are the final checkpoint in the engine management system. I think of them like a report card. If the O2 Sensors are right, the rest of the engine management system is right. If the O2 Sensors are not right, the rest of the engine management system is probably not right. (Except in the 20% of the cases where the problem is actually being caused by a failed O2 Sensor)
You'll need to give us the specific code, in the format P0xxx. Just saying "O2 sensor" doesn't mean anything. It could be the heater circuit, fuse, o2 sensor itself, etc. Changing an O2 sensor isn't too hard but you may not need to replace it/them.