P0135 Code - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1

What Does P0135 Mean?

The upstream oxygen sensor (O2S) is located ahead of the catalytic converter. It is used to determine the concentration of oxygen in the exhaust gas. This information is used by the PCM to control the engine air/fuel mixture. The sensor compares amount of oxygen in the exhaust to the surrounding air (there is an opening in the sensor that is exposed to the atmosphere). It generates a corresponding voltage which is transmitted to the PCM. The PCM then controls injector pulse based on this value.

Modern vehicles use a heated oxygen sensor (HO2S). These sensors contain a heating element that brings the sensor to operating temperature faster. This allows the PCM to use the signals input sooner, for more precise fuel control and reduced emissions. The heater circuit is energized through a relay that closes when the engine is cranked. The PCM monitors the heater circuit and will turn on the check engine light if it finds a problem.

Code P0135 stands for Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1). This indicates the PCM has detected a problem with the bank 1 oxygen sensor. Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine. If you’ve got a four-cylinder, there will only be one bank.



A typical heated oxygen sensor

engine code P0135	P0135 fix	obd P0135	dtc P0135
obd code P0135	obd2 P0135	P0135 car code	diagnostic code P0135
car code P0135	check engine code P0135	fehlercode P0135	P0135 fiat
codigo P0135	codigo falla P0135	P0135 kody b??dów	codigo de falla P0135

What are the common causes of P0135 ?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

What are the symptoms of P0135 ?

Symptoms of a P0135 diagnostic trouble code may include:

• Faulty or damaged wiring
• The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
• Poor fuel economy
• Rich or lean exhaust

How do you troubleshoot P0135 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0135 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.



Searches related to P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1

• o2 sensor heater circuit bank 1 sensor 2
• p0135 toyota
• p0135 honda
• p0135 chevrolet
• o2 sensor heater circuit cost
• p0135 jeep
• p0155
• p0135 ford