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1997 ford mustang 3.8 v6 ODC2 codes p 0151 ,p 1151 ,p 1270 whats the solution?

Replaced both upstream sensors(bank 1) one downstream sensor ( bosche universaloxy. sensor bank 2) .speedometer also has stopped working. Whats the fix?

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Check your vehical speed sensor

Posted on Apr 13, 2014

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SOURCE: oxygen sensor confusion

1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.

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SOURCE: 04 sebring conv, 2.7 l V6, Trouble code for Bank 1

The O2 sensor is the left side (sitting in vehicle) downstream sensor. Also refered to as 1 / 2 sensor.

Posted on Dec 19, 2010

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I need a oxygen sensor for a 1997 volvo am I needing a downstream or upstream...for my catalytic converter


In the OBD codes, sensor 1 failures are upstream and sensor 2 failures are downstream. If you have more than 2, then Bank 1 is for the ODD cylinders and Bank 2 is for the EVEN cylinders.

Oct 25, 2016 | Volvo Cars & Trucks

1 Answer

Engine Code O2 Sensor Circuit, HV Bank 1, Sensor 2


You did not say what your car was ,however most newer cars use 2 oxygen sensors per bank, if it is a 4 cyl replace downstream o2 sensor,if 6 or 8 cyl bank 1 sensor 2 is downstream sensor on bank that has cyl 1 on it.upstream sensor is in front of catalytic converter downstream is after the cat

Mar 17, 2015 | Cars & Trucks

1 Answer

Error code P1131 & P1151


Hope this helps you or future parties of intrest. P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1 P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2 I would get under your stang and gently clean outside portion of o2 sensors using a scotch brite. Also if you have so dielectric grease pull electrical connections to o2 sensors clean them and add grease. These trick eliminated the o2 sensor OBD1 codes on my 1987 Ford mustang gt

Oct 22, 2013 | Ford Mustang Cars & Trucks

2 Answers

Which sensor is the bank 2 sensor 1 for a 2001 nissan sentra?


Unless I am missing something the 2001 nissan sentra has two four cylinder engine options.

The bank refers to which side of the engine. a four cylinder only has one bank so there can only be a bank 1. A v-6 or v-8 will have two banks since there is a bank of cylinders on each side of the engine. So there will be a bank 1 which is always the same side of the engine as the number one cylinder, and a bank 2 which is always the other side of the engine.

Sensor refers to upstream or downstream of the catalytic converter. Sensor one is upstream or before the cat. Sensor 2 is downstream or after the cat.

If you entered the wrong year or wrong vehicle or if you can post the actual code I will see if I can help you further.

Sep 17, 2011 | 2001 Nissan Sentra

1 Answer

We have a 98 for mustang v6 3.6 liter engine. the check engine light came on and gave us the code p1131..i have searched the internet for possible solutions but want to know if any one experienced this to...


P1131 - Insufficent Switching 02 Bank 1 Sensor - 1 Sensor / Lean.

Sensor 1 on bank 1 is the passenger's side upstream 02 sensor.

Start by cleaning the MAS and Filter and see if this helps. If not, you will probably need to replace the O2 sensor.

It COULD also be a bad No.2 injector I believe

Jul 05, 2011 | 1998 Ford Mustang

1 Answer

03 santa fe code p0421 for warm up catalyst below bank 1is it converter sensors whats bank 1 converter location compared to bank 2 is there 2 banks or converters would it be upstream or downstream if it...


If the engine is a V6 (2.7 or 3.5 lit), bank 1 is next to the firewall (right hand) when facing the back of the engine.
If the engine is a 4 cly (I4), there is only one bank and is designated Bank 1 (exhaust manifold).

The catalyst to which the code refers is the UPSTREAM, and there is only ONE upstream cat for any bank.

Clue: Two upstream O2 sensor and two downstream O2 sensors - one before the CAT and one after the CAT. the downstream O2 sensors are identical to their upstream sisters. The only reason for the DOWNstream sensor is to monitor the CAT efficiency (threshold).

The catalyst on either bank is essentially the exhaust manifold which houses the CAT... it is the only CAT to which the code P0421 applies.

Hope that helped

Feb 06, 2011 | Hyundai Santa Fe Cars & Trucks

2 Answers

P0136, P1131, and P1151 codes on Ford Expedition 2000 4.6L


Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)

Code 1131= upstream; bank 1..sensor 1
Code 1151= upstream; bank 2..sensor 1
Code P0136 (generic code) bank 1..sensor 2 (questionable)

I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.


Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.

FixYaWIZ................saailer

Dec 10, 2009 | 2000 Ford Expedition

1 Answer

Replace oxygen sensors


these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

May 15, 2009 | 1998 Plymouth Grand Voyager

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