P0030 OBD Error Code: Problem & Solutions

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If you are experiencing failures in the heater circuit element, failures in the engine control module, Open or short on O2 sensor heater, then it might be an indication of the OBD Code P0030 error.

P0030 may be defined as a code for HO2S heater control circuit (Bank 1 Sensor 1). This code indicates that the engine should operate properly; the engine exhaust should have a specific air fuel ratio of 14.7 to 1 which is determined by the heated oxygen sensors (HO2S) which detect the oxygen content of the car exhaust. All this information is then later sent to the engine control module so that it can adjust the fuel which is delivered to the car engine.

What causes this problem with the Heater Control Circuit?

• The heater circuit element inside the HO2S might be failed or damaged
• The O2 sensor heater ground circuit may be opened
• There can be some failure in the ECM
• Open or short on O2 sensor heater B+ battery feed

1. Heater - OBD Code P0030 can flash if the car heater is damaged. You must replace it with a brand new one online with us.
2. O2 sensor - Did your mechanic just found out that there is some fault in the O2 sensor? Buy top notch O2 sensor from us at economical prices.
3. Sensor heater - Everything is fine with the engine control module and still OBD code P0030 flashing? Then there's definitely some fault with the Sensor heaters. Get it checked and replace if needed.
4. Engine Control Module - A damaged Engine Control Module can cause a lot of issues. It would be nice if you get it replaced on time.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The check engine light would start appearing
• With the O2 heater circuit not working the O2 sensor response time will be affected and the sensor will not respond to fuel and oxygen in the exhaust for the first 3 to 5 minutes of running or more
• The ECM would be affected by the lack of response and the ability to control the fuel mixture and it will go into a fixed fuel mix until the problem is fixed

• You must have a certified technician who can properly verify the code using a scanner
• Reset the fault codes and then later perform a road test
• If P0030 code returns once again, then you can always follow the test procedure. Several problems can arise, but the most common out of them is the wiring being damaged by excessive heat from the exhaust. Make sure that the wiring is in good working condition has proper voltage and ground to the sensor before you start to replace the sensor
• Make sure that the key is on and your car engine is turned off, then you can use a voltmeter to check for 12+ volts fused battery feed to the heater element. If you find out that there is no voltage present, then you must repair open or short in the 12-volt feed circuit, but first you must determine if it is really a need to replace any fuse blown from the short
• Now if you find out that the battery feed is perfectly correct, then you must remove the ground (control) circuit from the ECM wiring connector and the resistance on the circuit should be checked. If the resistance is infinite, then you must repair the open circuit

However, if you face any of these issues then you can have a look at our wide range of auto parts. We have stocked a wide range of best priced replacement parts, ECM/PCM parts and a lot more to help you out in fixing your car.

You can diagnose the P0030 error code using an OBD-II scanner. The mechanic can reset the OBD-II code and then later you can always test drive your vehicle to insect if the engine warning light and code is returning back or not. If it comes back on, the mechanic should check both power and ground to the sensor, including inspecting the wiring and sensor.

A lot of problems for this fault code are associated with wiring, due to the heat of the exhaust.

Common Mistakes When Diagnosing the P0030 Code

• Don’t be in a hurry because most of the people might assume that there is some fault in the HO2S and would start replacing it, but you must check the related wiring and the connector closely first
• The mechanic should ensure that there are 12 volts to the sensor and the ground is good
• Make sure that you check the both sides of the connector wiring to ensure that the connector is in good working condition and not defected