O2 sensors on car (all four) have been replaced. harness and wire have
also been replaced. Car has been to shop six times for same problem.
The light stays off for seveal days and then reappears on startup. Car
runs fine. has 116K. Plan on another 100K or so, but this makes the
light and computer useless if I have a real problem.
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Re: Service Engine Soon Light keeps coming on
Why did you replaced the o2 ??
were they wet ??
did you scanned the vehicle ??
any code ?? also when you serviced your vehicle did you erase the computer ?? reset the code ??
all that has to do with it.
please let me know so i can help you with it
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MOST LIKELY A BAD O2 SENSOR...Potential causes of an P0160 code include: Holes in exhaust near post cat o2 sensor Bad Bank 2, position 2, o2 sensor Wiring problem, melted harness, broken connectors, etc. Bad PCM
Error Code: P0154 Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected Problem areas:
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).
Hi there: Are you buy same or OE part replacement according with the Hyundai part number catalogue? This is important. Keep in midn that you need reset or delete all previous code stored in the car computer.
DTC P0131 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) Essentially the same as P0136 and P0137, a P0131 code refers to the first oxygen sensor on Bank 1. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 1 is located in front of the catalytic converter.
There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.
A code P0131 may mean that one or more of the following has happened: - Faulty o2 oxygen sensor - Short to voltage on O2 signal circuit - High resistance or open on O2 signal circuit
Possible Solutions: - Replace faulty sensor - Repair short, open, or high resistance on o2 signal circuit
A code P0135 may mean that one or more of the following has happened: - O2 Heater element resistance is high - Internal short or open in the heater element - O2 heater circuit wiring high resistance - open or short to ground in the wiring harness
Possible Solutions Repair short or open or high resistance in wiring harness or harness connectors Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
These codes, po 138 bank 1 sensor 2 shorted to voltage and code po158 means bank 2 sensor two shorted to voltage. these are the two rear oxygen sensors in the exhaust system. there two up frt and two in the rear, check the wiring on the two rear sensors, make sure that the wiring is not cut or stuck between metal. if the wiring is good then replace both rear sensors, when you get them ask for the left and right after the cat sensors. or bk1 s2 and bk2s2. after replacing them reset the computer. go to an auto parts sotre or if you have a code reader you can do it. hope this helps good day.
P1148 - Closed Loop Control Function Bank 1 This mean that the closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.
The Powertrain Control Module (PCM) or Electronic Control Module(ECM)
monitor the function of the Front Oxygen (O2) sensor or Air/Fuel (A/F)
sensor by comparing the signal with the Rear O2 sensor.
Symptoms: - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes: - Harness or connectors Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor 1 circuit is open or shorted. - Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 - Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 heater
Possible solution: - Repair harness or connector. If repair is needed - Replaced Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
Then, possible causes are faulty harness or connectors to the air fuel ratio
sensor, a faulty air fuel ratio sensor (1) or faulty air fuel ratio
sensor (1) heater. Most likely yes it is just faulty sensor. Just replace this devices and reset the stored codes.
P0432 - Main Catalyst Efficiency Below Threshold Bank 2 The ECM or PCM monitors the front an rear O2 sensors. The ECM or PCM
detects Warm up Catalytic Converter when the sensors are out of
DTC is set when the ECM or PCM detects rear HO2S value difference
becomes closer to value of front HO2S. The ECM or PCM monitors when
vehicle speed is 25-60 MPH, load is 22-45 percent and engine speed is
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes - Warm Up Three Way Catalytic converter deterioration or malfunction. - Exhaust system leaks. - Loose front or rear HO2Ss. - Front HO2S malfunction. - O2 sensors harness or connectors
Possible solution - Replaced Catalytic Converter - Replaced rear O2 sensor - Repair wire harness or connectors
Thats why you dont take advice from ottozone. First you may really have had an oxygen sensor problem, then you bought one from ottozone, ( who brag about how cheap their parts are) then you put in another cheap sensor. Have your car looked at by well equipped repair shop thats not trying to sell you car parts.
P0141 is for an open or short in the heater circuit of bank 1(passenger side) rear O2 sensor(the one after the catayltic converter). This code will set when the computer runs the heated oxygen sensor monitor which is basically a program kinda like an anitvirus scan on your home PC.
During testing, the HO2S heaters are checked for opens/shorts and excessive current draw. The code will set when current draw exceeds a maximum calibrated limit(3amps) or falls below a minimum calibrated limit(0.220 amps for NKT sensor and 0.400 amps for bosch sensor) and/or an open or short is detected.
Here are the possible causes for this: ·Blown fuse ·Short to VPWR in harness or HO2S ·Water in harness connector ·Open VPWR or GND circuit ·Low battery voltage ·Poor electrical connections from PCM to HO2S sensor ·HO2S heater ·PCM
Now the reason I ask what the codes were is that may help in determining what is wrong. If the other codes you had were also O2 heater cicuit codes example P0135, P0155, P0161 then you may need to be looking at something other than the O2's themself and maybe more toward a blown fuse no. 24 (15amp) in the under hood fuse box,wiring harness problem on the voltage side since all four share this one or a bad PCM.