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Limited performance sign on my cadillac bls. The engine malfunction sign was on for too long. I used a scanner which gave p0131 code. I changed tbe oxygen sensor. Car idling fine. The engine malfunction sign now off. The only remaining sign is limited performance sign. Is there anything I must reset?

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  • Cars & Trucks Master
  • 40,854 Answers

Yes . use a code reader and reset the light in the CPU.

Posted on Nov 19, 2013

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SOURCE: check engine light come on fault codes PO165 and PO155

Yes sorry but they both should be replaced. 

Posted on Dec 26, 2008

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SOURCE: 1997 ford escort speedometer not working

Well our escorts are built in liverpool uk and valencia here in spain,and if this is the problem with the autos many thanks for the info as it always comes in handy providing that i can remember it all .When you are a general mechanic like myself and not a dealer only so to speak ,then you have to fault find as you go along and work from basics.Now this is all very well on older vehicles but some of these new ones i cant evan change a battery without the immobiliser cutting in.Some of the newer mercs and VWs i cant evan change the oil or the brake pads without the immobiliser coming on.Also please dont mention the real bane of my life -----RENAULTS---and encrypted software .How these cars do in the states where the OBDII plug is connected into the car to test the emmisions ,with their renault only plug connector layout and encrypted software that would do mossad or the cia proud i can only wonder ??

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Check your transmission control relay, this would appear to be the fault in your system.

Posted on Oct 04, 2009

Testimonial: "Will try makes sense "

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SOURCE: Where is located the oxygen sensor on jeep grand

under truck follow the exhaust system back from engine - o2 sensors are screwed into exhaust pipe

Posted on Feb 15, 2010

  • 1796 Answers

SOURCE: I have a Mercedes s500

Hi!!
What all this codes have in common is that every single one of them can be caused by a vacuum leak, so carefully check for cracked, loose or disconnected vacuum hoses, wiring to the coils, fuel pressure regulator, fuel injectors, specially on cylinder 2.

  • PO100 - Possible causes are wiring harness failure, air leak or defective hot film MAF sensor
  • PO130 - Vacuum leak
  • PO170 - PO173 - Possible causes are air ingress (leak), fuel injector failure, pressure regulator failure or mechanical wear of engine. Inspect and repair as necessary.
  • PO300 - possible causes are vacuum leak, wiring harness failure or ignition coil defective.
  • PO302 - If limit value for misfire "harmful to TWC" is exceeded, the MIL flashes immediately. If too many combustion misfires occur in one cylinder, the cylinder is switched off (cylinder selective fuel shut off). After the affected cylinders are shut off, the MIL changes from flashing to continuously lit until next time the engine is started. If combustion misfires are recognized, the fault code P0460 or P0462 is set if fuel tank level is too low (fuel reserve indicator light is on). Combustion misfires due to a shortage of fuel are recognized by means of this additional information.

NOTE:After cylinder cut-out system is turned off, the system monitors (through misfire detection) if all intake and exhaust valves are open again.
NOTE:Misfiring may be caused by many faults in the fuel injection system. Usually a misfiring fault is stored with faults pertaining to other components. An engine mechanical fault could also cause a misfire condition.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

Posted on Dec 03, 2010

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I will give you what the codes mean and you can then work out what to replace.
code p0171 refers to system too lean--bank 1===causes intake / exhaust leak---AIR system---MAF/VAF sensor---fuel pressure/pump---injector/s---HO2s
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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
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- High resistance or open on O2 signal circuit


Possible Solutions:
- Replace faulty sensor
- Repair short, open, or high resistance on o2 signal circuit


Now, about DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)


A code P0135 may mean that one or more of the following has happened:
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- 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.

Thank you for using FixYa, have a nice day.

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2.Repair short, open, or high resistance on o2 signal circuit. FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook

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