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What does the code po 155 mean - 1999 Chevrolet Astro

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Oxygen O2 Sensor Heater Circuit Malfunction (Bank2, Sensor1)

Posted on Apr 14, 2014

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Posted on Jan 02, 2017

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2 Answers

Codes po 141 & code 155


If these codes only show after rain then the moisture is affecting the connections in the wires. Pull each connector apart and clean out with wd-40 or other water dispersant and ensure that the connections are water tight. Any dirt ,oil ,grease green gunk on the pins will cause a problem

Jul 18, 2014 | 1997 GMC Jimmy

1 Answer

Wheret is the heater circuit?


P0155 is an O2 sensor heater circuit problem Bank 2 sensor 1. Replace the O2 sensor closest to the engine on the passenger side. The heaters are built into the sensor. No repairing them.

May 06, 2014 | 1999 Chevrolet Astro

1 Answer

What could PO 302, PO 300, PO 105, PO106, PO 110,PO 115& PO 120 CODES Mean on a Toyota Camry 2000 model sedan car?


what engine, what size. that is first question.
misfire, map ,maf, iat, ect,tps and cat fail and low coolant temps.
very odd mix there. did you pull connections, key on???????

it means they all fail a test.
DIY? or just curious?

login to alldata.com
the question is , which is the most important.
all are cept 420, (last that, and bet goes way. later.)

reset the ECU, and see which come back.?
check all fuses.
then post codes that repeat, after fuse checks.

does the engine get fully hot running, 180F minimum?

Nov 27, 2013 | 2000 Toyota Camry

1 Answer

Po 155 code


O2 sensor heater circuit malfunction (bank 2 sensor 1)

Looks like you've got a problem with the O2 sensor.

Jun 25, 2013 | 2002 Dodge Intrepid

1 Answer

L got two po numbers am trying to solve. would like to know what they are. they are po# 155 and po#307


P0155 indicates a problem with the heater circuit for sensor #1 on bank #2. P0307 indicates a misfire detected in cylinder #7.

May 10, 2011 | 2004 Dodge Ram 1500

2 Answers

Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

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