What does that mean?
Essentially the same as
P0137,
a P0136 code refers to the second oxygen sensor on
Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The
ECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2
sensor voltage is high when exhaust is rich and low when exhaust is lean. The
ECM monitors this voltage and increases or decreases fuel injector pulsewidth
according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage
for an extended period, it will set P0136 Conditions required to set: HO2 sensor
voltage is low for longer than 2 minutes (minutes depend on model of
vehicle.
Could be up to 4 minutes)
Symptoms
There may be no visible symptoms to the driver. Poor
fuel mileage, possible
misfire, depending on O2 sensor position when sticking.
Causes
A code P0136 may mean that one or more of the following has happened:
- Faulty O2 sensor leak in exhaust close to O2 sensor
- Short to voltage on O2 signal circuit
- Open in circuit resistance caused by corrosion in connector
Possible Solutions
- Replace the second oxygen sensor on bank 1
- Repair open or short in signal circuit
- Clean corrosion from connector
A P0304 code means that the the
car's computer has detected
that one of the engine's cylinders is not firing properly. In this case it's
cylinder
#4.
Symptoms
Symptoms may include:
- the engine may be harder to start
- the engine may stumble / stumble, and/or hesitate
- other symptoms may also be present
Causes
A code P0304 may mean that one or more of the following has happened:
- Faulty spark plug or wire
- Faulty coil (pack)
- Faulty oxygen sensor(s)
- Faulty fuel injector
- Burned exhaust valve
- Faulty catalytic converter(s)
- Running out of fuel
- Poor compression
- Defective computer
Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code and
see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check
all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending
on how long the ignition components have been in the car, it may be a good
idea to replace them as part of your regular maintenance schedule. I would
suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable).
Otherwise, check the coils (a.k.a. coil packs). In some cases, the
catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter
needs to be replaced. I've also heard in other cases the problems were faulty
fuel injectors.
Replace the O2 sensor first and see if that helps clear the vehicle up some. Some times these codes will trigger other codes and these are the issues that you will get.
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