Question about Hyundai Elantra

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Have replaced both Oxy sensors when putting in new catalytic converter. Tried to inspected but trouble code for too rich f/a mixture in a bank. What else could be the problem if those sensors are not

One week prior code for a transmission ctrl relay came up & I replaced. We fix one thing then check eng lite comes back on w/ something else. A bad ECM?

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  • Brian Rowe
    Brian Rowe Apr 24, 2014

    found MAT sensor airflow hose disconnected. re-attached and cleared the code. Hopefully, one sensor was over compensating for issue w/ MAT. Waiting to see if chk eng lite reappears...

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  • Hyundai Master
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If you reattached the hose and the light went out or the code cleared then if there was the same problem it would be back on in short time . If it is still out and you want to be sure that you fixed the problem have the fault codes read to check for any faults recorded.

Posted on Apr 25, 2014

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My mazda demio 2001 its shows error code PO172 and the description show SYSTEM TOO RICH,BANK 1 and what its means?


This means your oxygen sensor is reading problems with your fuel/air mixture. May consider in replacing the oxygen sensor, the one before the catalytic converter.

Dec 23, 2016 | Mazda Cars & Trucks

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I have a code P0152 high oxygen sensor voltage on a Cadillac Deville 1999 what is the cause


Code 152 is for a high sensor signal from bank 2 sensor one. This is the sensor before the catalytic converter on the side with cylinder two.
The sensor is telling the computer the fuel mixture is too rich and that may or may not be true.
Code 175 is also for a rich mixture on bank two. Since you are getting both codes its possible you have a leaking injector on that side of the engine, or some other fuel problem.
It could also be a faulty O2 sensor sending a false signal.

Jan 22, 2013 | 1999 Cadillac DeVille

1 Answer

P1152 code


My definition says bank two sensor one is not switching - stuck on rich.
That means the sensor is telling the computer the fuel mixture is too rich. It could be true and there is a problem with an injector or the pressure regulator, or the sensor could have failed.
Bank two is the side with cylinder number two. Sensor one is before the catalytic converter.

Sep 19, 2012 | Ford F-150 Cars & Trucks

3 Answers

Engine wont stay on when started unless you step on the gas,service engine soon " light comes on.Scanned it and you get code po172 system too rich.


Okay, lets start with you checking the fuel preasure regulator, this is a common problem with these the regulator leaks and the vac line connected to it starts sucking gas into the intake, this causing it to run rich and depending on how bad the leak is it will stall engine at idle, remove the vacuum hose from regulator and start engine then see if gas shoots out the vac connection on the regulator, if it does then replace regulator, hope this helps.583ec1c.jpg

Oct 18, 2010 | 1999 Pontiac Grand Prix

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04 murano. will not accelerate. p0420 present. foot to the floor only goes 2-3 mph.


CODE PO420 CATALYST BELOW NORMAL BANK 1 .POSSIBLE CAUSE CATALTIC CONVERTER , WIRING , HO2S 2 HAVE VECHICLE PUT ON A SCANNER TO CHECK FUEL TRIM.A RICH FUEL MIXTURE WILL CAUSE THIS PROBLEM.MAKE SURE SPARK PLUGS AND WIRES GOOD AND FUEL INJCTORS ARE CLEANED NOT CAUSING ENGINE FLOODING MAKE SURE O2 SENSORS OKAY.IF YOU HAVE TO REPLACE THE CATALYTIC CONVERTER. AND FUEL SYSTEM STILL RICH IT WILL BURN OUT NEW CATALYTIC CONVERTER.YOU WILL BE REPLACING IT AGAIN.

Sep 05, 2010 | 2004 Nissan Murano

1 Answer

2006 hundai elantra P2270 code. If this is an O2 sensor, which one?


Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

Aug 06, 2010 | Hyundai Elantra Cars & Trucks

2 Answers

Fuel to rich bank 1


Change the primary oxygen sensor on the number one cylinder bank. Whichever bank has cylinder number one, is bank one. The primary sensor is the one between the engine and the catalytic converter on that side. There's a secondary sensor behind the catalytic converter, but the primary (pre-cat) sensor is the one used for determining fuel mixture.

Dec 10, 2009 | 1998 Chevrolet C/K 3500

1 Answer

I took my car to autozone to get the OBDII code. He said it was a O2 sensore but did not know which one? Also is it a 2 wire or 3 wire O2 Sensor for a 1996 850 Turbo?


When the codes are read they generally have an identifying number for the Oxygen sensors. For instance: "B1S1" This means" exhaust bank one, sensor one. THe first sensor of your first bank.

Your VOLVO 850 is an inline 5-cylinder, so it has just one exhaust bank I believe. So it should have an Oxy sensor upstream and one downstream of the catalytic converter. The upstream one is sensing lean/rich condition of your just-burned fuel mixture, while the downstream one measures efficiency of your catalytic converter. I suggest you go somewhere else to have the car checked and scanned. Nothing against the parts dealers, but those guys are barely cashiers, as you found out. It was free right? Worth just what you paid for it, nothing!!! Maintain your Volvo so it will take care of you for years to come.

Jan 27, 2009 | 1996 Volvo 850

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

1 Answer

20 mpg down to 11 mpg !


Replace your bank 1 (that's the cylinder bank with cylinder #1 in it, usually passenger side but verify this before changing parts) primary oxygen sensor. This is the one before the catalytic converter. The primary determines your air/fuel mixture, and if it goes bad, the computer will revert to preprogrammed fueling maps, which are fuel-rich by design (to safeguard the engine). Change the O2 sensor on bank one, before the cat, and maybe check your spark plugs as well (running rich too long will foul them) - for the minimal cost, it's worth changing them too.

Aug 29, 2008 | 1996 Plymouth Grand Voyager

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