P0158 Jeep Liberty

Can bad spark plugs cause O2 sensor code?

If spark plugs are misfiring (fuel isn’t ignited in those cylinders) so there will be excess oxygen (because it wasn’t consumed by the burning fuel).

The O2 sensor ahead of the catalytic converter will detect this and the ECM will set a code..

Does oxygen sensor affect catalytic converter?

A faulty O2 sensor can trigger a check engine light and also register as a failed catalytic converter, random cylinder misfires, camshaft/crankshaft positioning codes, and even transmission codes. Typically a replacement oxygen sensor can save you a lot of headaches and misdiagnosis.

Should I replace all O2 sensors at once?

O2 sensors are a “wear item” and are recommended to be replaced every 75k mi. … There’s no specified service interval for the O2 sensors, and 75K is way too short of time in my experience. I wait for symptoms of a bad sensor to appear (e.g., codes, MIL, poorly running engine) then replace them both.

Where is heated oxygen sensor located?

Heated Oxygen Sensors Oxygen sensors are located in the exhaust manifold or exhaust pipe of the engine’s exhaust system. The sensor measures the oxygen content in the exhaust stream. It sends an analog voltage signal to the PCM that varies between 0 and 1 volt.

How many volts should a oxygen sensor have?

It should be fixed for a short period at around 0.1 or 0.2 volts. 2) After two or three minutes, the voltage reading will begin to fluctuate between 0.1 and 0.9 volts. If the sensor takes four minutes or more to begin fluctuating, replace it.

What voltage should my O2 sensor read?

An O2 sensor will cycle between 0.10 to 0.90 or almost 1 volt. An O2 sensor has to reach the 0.8x Volts amplitude mark while at full operation. An O2 sensor also has to reach the 0.1x Volts amplitude mark while at full operation.

What codes will a bad O2 sensor cause?

In most cases, a bad (O2) sensor will trigger a check engine light. P0138 and P0135 are some of the codes you may expect to see on a OBD II reader. Other than that, it’s difficult to spot a failing (O2) sensor.

How can you tell Bank 1 and Bank 2?

Bank 1 and bank 2 simply refer to either side of the engine. Check your owner’s manual or a service manual for a positive location of bank 1 and bank 2. Most commonly, bank 1 houses the front most cylinder on the engine cylinder 1, and bank 2 is the opposite side of the engine.

What O2 sensor is bank 2 sensor 2?

Bank 2 is the set of cylinders that does not have number one cylinder. Sensor 1 is the sensor before the catalytic converter which the computer uses to make fuel ratio calculations. Sensor 2 is the sensor that comes after the catalytic converter and is mainly used for onboard emissions testing.

What is a bank 2 sensor?

The front oxygen sensor before the catalytic converter is usually called ‘upstream’ or Sensor 1. … “Bank 1, Sensor 2” is the rear oxygen sensor. Typically, the engine bank that. contains cylinder 1 is called Bank 1. A V6 or V8 engine has two banks (or two parts of that “V”).

What can a bad downstream O2 sensor cause?

A faulty oxygen sensor can cause the computer to supply the engine with too much or too little fuel. This can cause the engine to misfire and run rough. 3. Poor fuel economy: Similarly, a bad oxygen sensor can cause the computer to supply the engine with more fuel than it needs, resulting in poor fuel economy.

How do I fix code P0158?

What repairs can fix the P0158 code?Replace the rear oxygen sensor.Repair any oxygen sensor wires that have shorted out, are broken or exposed.Make necessary repairs to remedy the excessive fuel pressure.Replace engine coolant temperature sensor if it is necessary.More items…•Mar 25, 2016

How can you tell which O2 sensor is bad?

Several of the most obvious signs that the oxygen sensor is failing include:Reduced gas mileage.A bad smell like rotten eggs coming from the exhaust.The check engine light comes on.You notice that your engine idles roughly.The car is suddenly hard to start.

How many O2 sensors does a Jeep Liberty have?

Oxygen sensors are located before and after the catalytic converter. A vehicle may have two to five oxygen sensors, and sometimes even more.

Can I drive with a bad O2 sensor?

In summary, yes, you can drive with a faulty O2 sensor. But you’ll want to change it immediately, because otherwise, you’ll be spending more money on fuel and you risk having to spend more on a new catalytic converter as well.

What causes high voltage on O2 sensor?

The high voltage condition from the O2 sensor is indicating a lack of oxygen in the exhaust or other related problems, such as a leaking fuel injector or a broken up catalyst inside.

How do I know if my upstream or downstream oxygen sensor is bad?

A decrease in fuel efficiency can be a telltale sign that an O2 sensor is not performing as it should. This can happen because of a fuel mixture that is either too lean or too rich. Such a swing in A/F ratio is a sign that an upstream or control sensor is faulty.