Question about Toyota Sienna
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Posted on Jan 02, 2017
SOURCE: i ahve a engine light
P0135 = O2 Sensor Heater Circuit (Bank 1 Sensor 1)
Oxygen sensor heater element malfunction.
P0155 = O2 Sensor Heater Circuit (Bank 2 Sensor 1)
Oxygen sensor heater element malfunction
Both up stream (before the cat) 02 sensors are internally broken. The Heater Circuit is internal and can not be repaired. You need to get them replaced.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on Nov 29, 2010
a vacuum leak could cause this. dirty air filter. worn out plugs dirty fuel filter. the codes dont necessarily mean the o2 sensors are bad just that a condition exists. lean/rich that the o2 sensors are picking up. examine these items to see they are clean and in good working order. hope this helps
Posted on Feb 12, 2011
Lets look at these codes and what they imply is a problem.
P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor
P0155 - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor
The O2 sensors in this system have tiny wire filament heater in them, this allows the O2 to reach operating temperature very fast, if you turn the key on and wait a few seconds on a cold engine you will feel the sensors get hot very quickly, hot enough to burn your fingers. Here are the reason's that cause the codes to set for the heater circuits of the sensors.
Heated Oxygen Sensor (H2OS) Banks 1 and 2 Sensor #1 circuit open shorted to ground.
- Heated Oxygen Sensor (H2OS) Banks 1 and 2 Sensor #1 circuit poor electrical connection.
- Faulty Heated Oxygen Sensor (H2OS) Banks 1 and 2 Sensor #1 circuit (both of them, no not likely)
- Heated Oxygen Sensor (H2OS) Banks 1 and 2 Sensor #1 circuit fuse or fuses blown/open. (Very likely)
- Faulty Engine Control Module (ECM) (very unlikely)
Posted on Sep 15, 2011
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