Question about 1997 Mercury Grand Marquis

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How do you know which sensor it is by the number HO2S21

ON THE NUMBER HO2S21 WHAT DOES THE 2 AND THE 1 REPRESENT

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The 2 represents bank 2, and the 1 represents sensor 1

Posted on Apr 07, 2014

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  • juan escobedo
    juan escobedo Apr 07, 2014

    HO2S STANDS FOR HEATED OXYGEN SENSOR, THE 2 STANDS FOR BANK 2, AND THE 1 STANDS FOR SENSOR 1

  • juan escobedo
    juan escobedo Apr 07, 2014

    Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine

  • juan escobedo
    juan escobedo Apr 07, 2014

    so it would be the first o2 sensor before catylatic converter

  • juan escobedo
    juan escobedo Apr 07, 2014

    refering to upstream

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1 Answer

I have 1994 ford Thunderbird xl,ran a test it said ho2s21 switch-sensor rich, p0001,oasis403400, what does this mean?


Your 0/2 for bank 2 is signalling rich mixture and you need to determine why. This may be beyond your expertise.

Mar 11, 2016 | Ford Cars & Trucks

1 Answer

How do you know what O2 sensor is out the code was HO2S21 what does the 2 and the 1 at the end represent


Your better of Googling your questions

Everything you need to know about vehicles
& OBD2 Codes, is all over the internet

Need to study OBD 2 Systems (1996 thru 2013)


Oxygen Sensors

S11 is the passenger side-- on the exhaust
before or in the converter
S12 is the driver side exhaust

Both of those are the front or upstream sensors
that control the fuel trim or injector pulse

If you had a S21 or S22 they would be the sensors in the
converter at the outlet

They are called downstream or Monitors

Those don't do a thing until the converter looses
efficiency,then they watch the switching ratio between
the front & rear, to tell you the converter has failed


HO2 --is Heated Oxygen Sensor

11-front sensor-right side (on a Ford)
12-front sensor-left side
21-rear sensor-right side
22-rear sensor-left side

Not all vehicles are numbered the same as a ford

Mar 30, 2014 | 1997 Mercury Grand Marquis

1 Answer

Lack of ho2s21 switches - sensor indicates lean


this one is hell

http://www.obd-codes.com/trouble_codes/ford/p1151.php

Oct 02, 2013 | Lincoln Town Car Cars & Trucks

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I have code 1151 on Mi 1999 ford expedition


P1151 Lack of HO2S21 Switches - Sensor Indicates Lean
Suspect that this is technical jargon for a faulty -O2 sensor ,Test them both with a multimulter for function .

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Where is a HO2S21 sensor located on a 99 mecury cougar?


Its saying bank 2 sensor 1 Bank 1 is the same side of the motor as the number one cylinder. Bank 2 is the other side of the engine. Sensor 1 is always before tha catalytic converter. Sensor 2 is always after the catalytic converter. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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Check engine light on 1999 Crown Victoria - CNG


Oxygen sensor -sensor #2 on Bank #1. If I fix ya leave me a fix ya comment. Good Luck

Dec 27, 2008 | 1999 Ford Crown Victoria

2 Answers

Sears did a computer eval on our car and gave us codes only


P0135--OXY SENSOR HEATER CIRCUIT(bank 1 sensor 1)
P0141--OXY SENSOR HEATER CIRCUIT(bank 1 sensor 2)
P0155--HEATED OXY SENSOR HEATER CIRCUIT(bank 2 sensor 1)
P0161--HEATED OXY SENSOR HEATER CIRCUIT(bank 2 sensor 2)
P01132--LACK OF HO2S11 SWITCH--SENSOR INDICATES RICH
P01152--LACK OF HO2S21 SWITCH--SENSOR INDICATES RICH

Here are the code definitions.hope it helps.

Nov 15, 2008 | 1997 Mercury Cougar XR7

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