What does P0125 obd2 code mean?

Answer 1

A code P0125 may mean that one or more of the following has happened: * Insufficient warm up time * Low engine coolant level * Leaking or stuck open thermostat * Faulty coolant temperature sensor Another Opinion. Some cars have 4 wire 02 sensors, with 4 wire 02 sensors P0125 can mean your wiring is faulty, as in you missed wired it or its grounded. It can also denote more than one 02 sensor malfunctions. The code often denotes a problem specific to the post cat 02 sensor/'s This is a fuel combustion sensory problem, usually not an engine coolant problem. Additional note: I agree. This is not a "coolant" problem. More often than not, it is an oxygen sensor on one of the banks. Best way is to invest in your own OBDII reader that has a "real time" read out of your car's signals. A P0125 will indicate that your engine is running lean as well. Check the output voltage signals that your oxygen sensors are giving out. I believe it should give a range signal of .04 to .08 voltage output depending on the idle or how much gas you put in. If one of the banks has a STEADY voltage output (i.e. no longer fluctuates), replace that particular O2 sensor. Under normal condition, it's suppose fluctuate when the engine is running. If the voltage signal no longer fluctuates, it's due for a replacement. The reason behind this is that the computer readout is starting to mis-calculate based on the wrong signal output of the bad sensor. It will then automatically try to compensate to balance the rich/lean gas ratio. But because the computer's calculation will never be correct due to the wrong voltage signal, you will then get P0125. DO NOT BUY A GENERIC BRAND when replacing an O2 sensor. That's what got me in to this mess. Stick with an OEM sensor. Try SPARKPLUGS.COM for O2 sensor replacement.