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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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48 views

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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1answer
16 views

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 ...
2
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0answers
14 views

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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0answers
13 views

My Chevy Captiva is dying while I am driving

While driving my car cuts out and sometimes it starts back the same time and at other times it can take an hour before starting. At first I was told it was the alternator but that was replaced with a ...
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0answers
9 views

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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0answers
32 views

my car produces bad smell while in spees and also vibrate while starting the engine. what could be problem?

my car produces bad smell while in speed and also vibrate while starting the engine. what could be problem? it first lost the power and i changed the oil pump and air filter
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0answers
27 views

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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0answers
51 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 ...
2
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1answer
191 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 ...
0
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1answer
24 views

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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0answers
17 views

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 ...
2
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1answer
29 views

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
21 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
56 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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0answers
33 views

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
26 views

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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2answers
124 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 ...
2
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1answer
33 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
231 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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1answer
158 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. ...
3
votes
1answer
901 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 ...
3
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1answer
29 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
50 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
368 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
445 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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2answers
55 views

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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0answers
92 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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0answers
27 views

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 ...
3
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1answer
291 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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2answers
60 views

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 ...
1
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1answer
56 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
2k views

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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0answers
19 views

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 ...
4
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1answer
59 views

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 ...
5
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1answer
362 views

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 ...
2
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2answers
51 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 ...
3
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1answer
705 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 ...
2
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3answers
884 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 ...
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2answers
156 views

O2 Sensor Problems

So let’s say for some reason that my o2 sensor is unplugged. If I jump 0.2 or 0.3 volts to the harness going back to the ecu would it work into tricking the engine to run a little less rich to save ...
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0answers
60 views

O2 Sensor Voltage Output

I have an Acura legend (1995) that I did a header swap on and replaced the o2 sensors. They aren’t connected as of now and the car is running rich because of it. If I wanted to trick the car into ...
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3answers
1k views

Removing stubborn o2 sensor - danger of stripping thread?

(2002 Toyota Previa/Estima/Tarago ACR30, engine 2AZ-FE) One of my two pre-cat O2 sensors is faulty. The garage I put the car in did not manage to replace it - they told me it is stubborn and that ...
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0answers
59 views

Frequent Oxygen Sensor dirty problems (volvo diesel)

I have a volvo S60 diesel for 10 months (more than 30.000 Km), and I already have to clean the oxygen sensor once and seems that I have to clean it again. My question is what can I do to reduce the ...
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0answers
247 views

What is the normal voltage of 5-wire oxygen sensor (lambda probe)?

I have got a 2007 Opel Vectra GTS 2.2 Direct car (which still has a high pressure fuel pump problem, yet to be solved). Petrol, 114 kW, engine Z22YH. After getting an P0130-52 (No Plausibility ...
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1answer
440 views

Fixing an exhaust leak at the O2 threads

I've been getting really horrible gas mileage on my 2003 Nissan Primera, and at inspection they said I seem to have an exhaust leak. So I took off the heat shield and sprayed some soapy water in ...
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0answers
209 views

Oxygen Sensor P0130 Error code

I have a toyota corolla with fixed Short and long fuel trim values of -0.04%. This values don't change regardless of the engine or vehicle speed. I also have a fixed O2 sensor value of 0.075V. I ...
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1answer
311 views

What formula is used when deriving AFR/lambda value from emissions?

When you get your vehicle hooked up to a gas analser, you'll see the 4 or 5 kinds of emissions you're interested in, and a lambda or AFR value derived from those emission values. I was wondering how ...
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1answer
38 views

2014 Ford Taurus, digital fuel indicator is out of norm, then check engine light came up

My car at a full tank of gas usually have an estimate milage per the fuel indicator of 425 miles. Recently, when I filled up my tank I noticed it went down to 380 miles. Then weeks later my check ...
2
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1answer
241 views

2006 Hyundai Sonata GLS emissions fail

I own a 2006 Hyundai Sonata GLS 3.3L v6 and recently gave it for some repair work after which the car failed emissions test.The shop told me that the oxygen sensor and Catalyst Monitor are not ready ...
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0answers
44 views

Need help fast with my truck please

My 1994 dodge Dakota v8 starts fine and ildes fine. If I drive for about 10m my engine light comes on and my code for the 02 sensor goes off. My truck is straight piped and has no cat it has a steel ...
2
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4answers
708 views

O2 sensor high voltage

I am here today thinking that my father's O2 sensor on his 2003 Dodge Ram 2500 v8 van is bad, but I'm not 100% sure. Considering how expensive they are, I would like to have some other minds on this ...