P0139 Engine Error Code

When you check engine light came on code P0139 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the P0139 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on your car models.

P0139 Code Symptoms

P0139 Code Reason

Parts or components should not be replaced with reference to only a P0139 DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

P0139 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P0139 OBD-II Trouble Code The Heated Oxygen Sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio)

P0139 Code Review :

The reason of P0139 OBD-II Engine Error Code is P0139 O2 Sensor Circuit Slow Response Bank 1 Sensor 2.

P0139 Code Dictionary Meaning:

p - Powertrain Code - Problem is related engine, transmission and emissions systems.
0 - SAE - Generic
1 - Fuel And Air Metering
3 - Low Coolant Circuit
9 - A/C System High Pressure High Temperature