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Questions tagged [o2-sensor]

Questions and discussions about oxygen (O2) sensors. Oxygen sensors are used to measure the exhaust gas concentration of oxygen for internal combustion engines in automobiles and other vehicles.

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Why are my oxygen sensors staying at 1.275v most of the time?

I have an old Volvo s40. Because I had gotten a P0420 code and because of it, an OBD scan tool, I noticed that my fuel trims were very high. Or they could be the result of the age of the car (17 years ...
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64 views

Engine lean issues

Vehicle is a 2006 Ford Courier, started having hesitation/loss of power after fill up at a gas station that I'd never been to before. I depend on it for transport so I'm forced to still drive it, ...
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1answer
54 views

Do I need to replace my O2 sensor?

I bought a 2008 Nissan Versa LS last month. It has 235,500 kilometres on it but the engine and transmission run quite well. Last week, the “Service Engine Soon” light came on when I started it up ...
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2003 toyota sequioa oxygen sensor upstream color code diagram

2003 toyota sequia 4wd engine side the harness connector ripped, i need the color code.Engine side the wires are green with red stripe, green with white stripe, black, white I dont know how to rewire ...
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1answer
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Test 3 wire NTK, Bosch O2 sensor signal after heat up, but, not signal. Why?

I have a 1996 Nissan Altima O2 + Catalytic converter not ready. I want make sure O2 sensor really work. Upstream sensor (before CAT) work by measuring voltage when heated up with torch. Downstream ...
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1answer
19 views

2008 chevy 2500HD 6.0L

Rear O2 sensor plug on drivers side has been torn off of the main harness leaving only two wires left to go to the O2 sensor. O2 sensor appears to have had 4 wires coming from it. How do I rewire ...
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3answers
71 views

Matching up connections on O2 Sensor for 2001 Honda Accord

I purchased a new O2 Sensor for my 2001 Honda Accord and I cannot understand why it has a female plug and not a male plug as the existing one has so I assume I have to move the wires from the new unit ...
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Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
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112 views

HP Tuners disable downstream O2 sensors (FAOSC)

I deleted my catalytic converters on my Ford Taurus 2013 N/A because was giving p420 CEL, and tuned with HP Tuners to disable CEL from p420 , p430 and disabled catalyst test and downstream O2 heaters ...
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How can I swap wires/pins on generic aftermarket O2 sensors?

I purchased some generic aftermarket O2 sensors for my 2002 Land Rover Discovery 2, which were significantly cheaper than the "official" Land Rover replacement parts. Unfortunately after installation,...
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AF/O2 and Fuel Trim data - Normal or not?

I'm learning to diagnose my car's poor gas mileage: Car: 2010 Toyota Matrix (Base). Engine: 1.8L, 4 cylinders, Auto, FWD. ODO: 103,000km (64,000 miles). City gas mileage: 12.6L/100km = 18.6 mpg (...
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672 views

2005 toyota camry 3.0l bank 1 sensor 2 where is it

i have a 2005 toyota camry v6 3.0l it needs a bank 1 sensor 2 where is it or which one on the exhaust is it. im not sure about words like downstream just want to make sure
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1answer
52 views

Should my check engine light be on if an O2 sensor is physically absent?

I have a 2009 Pontiac Vibe. The Check Engine light was on and I took it in to a mechanic. He told me that the downstream O2 sensor was not responding and that he physically removed it. He said that ...
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1answer
210 views

Can I interchange the two downstream o2 sensors?

I got a new catalytic converter for my Honda Civic 2005 HX car because the "coal" inside went lose and was just making noise inside of it. While trying to take off the old O2 sensor I ended up ...
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What causes narrowband O2 sensor behaviour?

It's a given that narrowband O2 sensor (Lambda) output swings up and down within the 0-0.9v range, but everywhere (on the 'net including here) I am seeing people say this is due to the ECU in closed ...
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Loss of Power and increased engine knock in my 2011 Ford Ranger Truck. Bad Gas or Bad Oxygen Sensor?

This past summer I've been noticing that my truck is not making the same power as it used too and I've noticed a pronounced increase in engine knock (detonation). The detonation usually occurs when I ...
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o2 sensor problem

I have a SEAT Toledo 1.6L 16V with engine code AZD. I was getting an error code for the Bank1 Sensor1 because of a blown fuse but I didn't know that then and I replaced the Bank1 Sensor 1 with this ...
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Does anyone know the OEM for the 2006 Infiniti qx56 oxygen sensors

I've got the part numbers and some cross references for the 2006 Infiniti QX56 oxygen sensors, but I would like to buy from the OEM. Bosch? Denso? infiniti front left/right 226937S000 bosch 17204 5 ...
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Check engine light won't stay off

I've attempted to get my check engine light fixed a couple times and at each repair facility they've scanned the code and told me it was a bad oxygen sensor. I had the oxygen sensor replaced at both ...
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167 views

p0140 and p0172

I have a 2005 Elantra (205K miles). I replaced the second o2 sensor (downstream; after cat), added a defouler to second o2, replaced cylinder # 2 injector, air filter, tune-up. If the car is at idle ...
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1answer
2k views

Loosening O2 sensors with brake fluid?

So my 2010 Prius recently got a code for the upstream O2 sensors heater circuit (P0031) and I tested the heating coil and the circuit is not complete so I ordered a new one. The old one obviously is ...
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Can you mix black oil caued by poor air fuel ration with new oi?

Every time I used to drain and add oil it would quickly turn black. That was most probably because i've been driving with a faulty o2 sensor and apparently the air fuel ration due to this is one ...
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1996 Infiniti g20 fails smog

I am the original owner of this CA car, and have been gradually having higher HC readings on smog checks. It failed in 2016, cleaned out the Air flow components; it passsed, but this increased the NO ...
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1answer
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Interpreting secondary O2 values

The vehicle in question is a Piaggio Porter, make and engine data are unavailable atm. The car was in really bad shape before the repairs: missed oil changes, oil consumtion, heavy soot contamination, ...
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1answer
67 views

1996 dodge dakota 4 cylinder 5 speed

Bought a new upper o2 sensor but the clip on wiring harness is melted so I want to straightwire them to o2 sensor. Harness wires... black, tan, gray, green with orange stripe Oxygen sensor... black,...
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2answers
288 views

Post CAT O2 sensors disagree

2008 BMW M3, 125,000mi, the ODB Readiness monitor for the O2 sensor won't become ready. I replaced the two post-CAT O2 sensors and I'm still seeing the two sensors disagree. One is showing rich and ...
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Variance - What is on the Vehicle and what the FSM states

2007 Honda Accord Manual Transmission DTC indicated: P1157 Usual remedy is to replace the oxygen sensor But I wanted to follow the diagnostic tree in the service manual until I discovered something ...
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1answer
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O2 sensors located

need to know on a 2012 dodge caravan sxt v6 where are the o2 sensors located. Esp. upstream sensor 1 bank 1? Tried to look for them from above but no luck so far.
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3answers
391 views

Is obd code P0133 anything to worry about?

The day before I got this obd code I changed clutch and gear box oil. 15 minutes before I got this code one of my brakes pads completely wore out. I read a bit about the code and I guess they are not ...
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1answer
84 views

P0140, Voltage stuck rich under load

I have 2005 Elantra. I have no exhaust or vacuum leaks. I've replaced the sensor with a new sensor (Bosch = High Quality). I inspected the wiring harness the best I could (to the point it goes into ...
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3answers
2k views

Gas pedal floored yet the car can't reach maximum speed

I'm running a manual Opel Corsa 2005 Sedan (engine code: C16SE, 1600cc). The problem I'm encountering is that the car won't reach its maximum speed of 200km/h as similar cars do. Instead, it stops ...
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477 views

Rear oxygen sensor signal rate of change and p0420

What is the minimum time rate of change (absolute value) of the rear o2 sensor signal voltage that will trigger a p0420 dtc? This is probably vehicle specific, but a ball park figure would help. ...
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1answer
2k views

Rough idle and 02 sensor voltage drops to zero, cylinder 2 misfire

Vehicle is a 2007 Dodge Nitro R/T with a 4.0L engine. I've had a lot of trouble diagnosing a cylinder 2 misfire and looking for help on next steps. Symptoms After engine is warm, stop and go ...
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1answer
44 views

Electric Throttle Body Volvo S70 2000

So I had my volvo brought in to replace the o2 sensor so I could get my emissions done. (Car ran completely fine). After picking it up, it ran fine to my house. The following day, when I turned the ...
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1answer
87 views

2001 Vw beetle 02 sensor car will not go over 65mph

I have a 2001 vw beetle 2.0 engine with 171,000 miles on it. I have a check engine light on saying that bank 1 lean. It has been like this for years and I have had no problem with it. Yesterday I ...
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2answers
2k views

Trouble rewiring O2 sensor harness after dogs ate it

This is a 2005 GMC Yukon 4x4 4.8 L. Ok, dogs actually ate my harness going to Bank 2 Sensor 1 O2 sensor. The connector from the body side of the wiring is completely gone. I found a connector I can ...
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2answers
1k views

Can the same O2 sensor provide narrowband and wideband output simultaneously?

Is there an O2 sensor that has wideband and narrowband readings all-in-one? I wanted something like this to get a good air fuel ratio readout while keeping the stock ECU which uses narrowband.
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Car stalling after rack and pinion replacement

I need help. I just had the rack and pinion replaced,it is rebuilt, on my 2001 325i BMW. Now it has a very rough idle and is stalling. Stalls at slow speed or when moving off. I returned to the ...
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236 views

2001 Toyota Rav4 O2 sensor change

When changing O2 sensor B1 S2 on 2001 rav4 do you have to loosen the engine mount to access sensor with o2 socket, or is there an easier way?
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2002 Nissan Sentra XE (1.8) bogs down under heavy acceleration

This is my first time asking for help here so please bear with me. As the title says, my 2002 Sentra XE bogs down when my try to accelerate hard. It's more noticeable from a stop, but seems to do ...
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1answer
898 views

Engine Type Confusion

Can someone tell me the difference between these two engines? I'm trying to find an O2 sensor for my 2009 F150 and while looking for parts I came across this (apparently) very important distinction (...
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Bad fuel efficiency and suspected sticky / dirty injectors

The fuel efficiency on my 99 Nissan Almera 1.6L MTX has always been a bit below what I would expect, and the idle has gotten a bit rough lately, so I started poking around with a scope to see what I ...
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1answer
68 views

Why do some applications show ignition signal in the O2 signal?

I had read somewhere that some cars show the ignition signal as interference in the oxygen sensor signal when viewed on a scope. It turns out my 98 Mazda 626 is one of those applications: The full ...
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4answers
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Trying to Understand Post Cat O2 Behaviour During a Misfire

I've been researching using pre and post cat O2 waveforms to diagnose misfires and ran across this quote from the article, Intermittent Engine Misfire Analysis: Keep in mind that the downstream, ...
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Gasket Shellac on Flange gasket Dripping on O2 sensor Jeep XJ

Background I recently replaced some cracked headers on my Jeep XJ. When attaching the new headers to the exhaust with a flange gasket I didn't slide the graphite gasket ring on correctly and it went ...
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Cat Converter Replacment & Sensors

I recently got a check engine light telling me that the O2 sensors had issues so I replaced them. The problem persistent, took it to make dealer and told it was the AF Sensors. I then replaced those ...
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1answer
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02 sensor displays constant 3.3 volts, not a jagged waveform. 2002 rav4

Got P0420 and P0430 codes, suggesting the catalytic converter needs to be replaced. Everything I have read suggests the wave form after the cat ( sensor 2) should be a delayed version of before the ...
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2answers
143 views

2000 Honda CRV exhaust: keep old oxygen sensors?

I have an old 2000 Honda CRV, where the 18 year old exhaust is on its last legs and in need of a full replacement. The B-pipe bolt mount on the catalytic converter has rusted off, and the cat heat ...
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1answer
2k views

Extremely bad gas mileage caused by bad Lambda?

I noticed recently that my gas mileage on my 99 Nissam Almera 1.6L ( EU version of the Sentra basically ) has suddenly gotten really horrible. I connected to the Nissan Consult interface and used the ...
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3answers
4k views

Will adding a 90° O2 sensor adapter hurt anything?

Does a 90° O2 sensor adapter act as a spacer also? From what I understand adding an O2 sensor makes the engine run leaner since it senses less o2 (But I don’t know if that’s how it works so please ...