Guide To P0042 OBD Error Code Solutions
OBD Code P0042 Heated Oxygen Sensor Control Circuit B1S3
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Improper fuel-air ratios can lead to loss
of engine power, loss of acceleration and stalling as well as rough idle
problems along with check engine light illuminating. This can be due to P0042
error indicating problem with H02s heater control circuit.
P0042 is telling us the ECM has detected a
fault in the heated oxygen sensor control circuit for bank 1 sensor 3.
Learn More About OBD Error Code P0042
Heated oxygen sensors are usually present in the fuel
injection vehicles both before and after the catalytic converters to check on
the oxygen levels in the air for proper maintenance of fuel to air ratios.
Fuel injected vehicles use heated oxygen sensors in
the exhaust system before and after the catalytic converters to determine
oxygen content. This feedback is used to adjust the fuel system accordingly to maintain
a proper air/fuel ratio of 14.7:1.
The oxygen sensor uses heater circuit for faster
feedbacks to the ECM/PCM. It usually has four wirings out of which two send
data to the PCM and two and connected to the heater of the circuit, with all
the four wires grounded separately. The P0042 code refers to the third sensor
downstream from the engine on bank 1, which is on the side of the engine with
the #1 cylinder.
What
causes problem of HO2S Heater Control Circuit (Bank 1 Sensor 3)?
- Failure of Bank 1 Sensor 3
- Sensor wiring open/short/damaged
- Open circuit inside Oxygen Sensor or open/ground wires
to Bank 1 Sensor 3
- Corroded or Broken Exhaust System ground strap
- Rare ECU (Engine Control Unit) failure
- PCM/ECM or Oxygen Sensor Heater Circuit wiring failed
Replace/Repair These Parts To Fix OBD Code P0042
- Heated Oxygen
Sensor - A faulty sensor will
not be able to perform properly and not analyse the air to fuel ratio in the
exhaust. Replace damaged oxygen sensors now!
- Heated Oxygen
Sensor Harness -
OBD Error Code P0042 may also occur if the sensor harness is damaged as it
won’t be able to transmit correct data. Shop for quality oxygen sensor
replacement parts now!
- Heated Oxygen
Sensor Connector -
A faulty Oxygen Sensor Connector can also lead to improper engine functions.
Replace your old connectors now.
- Heater Circuit Fuse - Damaged Heater Circuit Fuse affects
the fuel delivery as well as the exhaust systems. Visit us for quality fuses
and parts.
- Engine Control
Module -
OBD Error Code P0042 can also be due to faulty EVMs. It’s better to get the
faulty electricals replaced as soon as possible. Replace faulty ECM today!
- Powertrain Control
Module -
P0042 error code also relates to problems with the powertrain which can store
and flash wrong error code. Find all the Powertrain related parts with us.
- Catalytic Converter - Excessive amounts of
unburned gas caused by a misfiring spark plug or a leaky exhaust valve can
cause overheating of catalytic converter. Replace your old catalytic converter
now!
- Diagnostic Tool - In order to detect the
error, one needs high grade diagnostic tools. Visit us today to grab amazing
deals.
- Exhaust System - Replace faulty exhaust systems and
parts as they can be a major reason for flashing of this error in the PCM.
Symptoms Of OBD Error Code P0042
The ECU tries to control the heater circuit and when it detects the issue with the control circuit, it may flash the Check Engine Light on the dashboard.
How To Correct P0042 Heated Oxygen Sensor Control Circuit B1S3
Following are the ways to correct the OBD Code P0042
error problem.
- Replacement of Bank 1 Sensor 3
- Repair/Replace damaged/short/open wiring
- Changing Bank 1 Sensor 3 fuse
- Replacement of ECU
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Easy Diagnosis Of Engine Error OBD Code P0042
- Take the help of a qualified technician to use a scan
tool and confirm whether P0042 is present.
- Find and freeze frame data with the code. Then, clear
the code.
- Take the vehicle on a test drive under the same
conditions.
- If the code reappears, perform a visual inspection of
the bank 1 sensor 3 and its wiring.
- If the wiring is okay, the sensor itself will be
tested to confirm operation.
- If the HO2S is functioning properly, the technician
must check the Engine Control Unit for any faults and damages.
Common
mistakes when diagnosing the P0042 code
Always take professional help and follow the diagnosis
instructions properly before coming to a conclusion or simply replacing the
sensor first.
- Replacing PCM, without checking other components for
faults
- Replacing Heated Oxygen Sensor directly
- Not inspecting faulty wiring and connections