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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1answer
106 views

Exhaust on a replaced motor

I recently had to change the motor in my 2004 Hyundai Sonata. I bought a used one from the junkyard, and it fired right up after I got it put in, and all the wires, hoses, etc. connected. The only ...
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1answer
983 views

CEL code 43 on 1992 Civic

I'm getting CEL code 43 after doing a lot of work on my car (changing the head gasket, which involved removing and reattaching lots of exhaust and intake components, and replacing the fuel filter and ...
4
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1answer
116 views

Why would one install widebands on vehicles that are setup for narrowbands?

A recent post on one of the forums I frequent has piqued my curiosity. From my limited reading on the topic, widebands do a better job of quantifying air-fuel ratios than their narrowband ...
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4answers
1k views

Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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1answer
2k views

Replaced my upstream O2 sensor, still get P1133 code

I had the following error codes P1133 - HO2S Insufficient Switching Bank 1 Sensor 1 P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1 P0130 - O2 Sensor Circuit Bank 1 Sensor 1 P0442 - EVAP ...
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1answer
162 views

Difference between P0133 and P1133

What is the difference between P0133 and P1133? I believe my car has thrown both of these error codes because I've written them down, but I can't find any difference by Googling them.
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2answers
2k views

P2195 trouble code 2007 Toyota Sienna

I have a P2195 trouble code with my 2007 Toyota Sienna CE. This is O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1. It's a little confusing but if I am reading my Haynes manual correctly, the ...
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1answer
9k views

Must the voltage of the post-cat O2 sensor cross 0.5V?

I understand that the voltage on the pre-cat O2 sensor must cross 0.5V (by a 0.3V margin). Is it also the case that the voltage on the post-cat sensor must cross 0.5V? The following image clarifies my ...
4
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1answer
95 views

For the love of all things sacred, what technical reason was there for GM to put a different connector on each side for the rear oxygen sensors?

I just busted my knuckles breaking the oxygen sensors free in hopes of swapping them to see if the problem stayed on the driver side or went with the sensor. Only to find out the connectors are ...
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1answer
88 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 ...
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1answer
8k views

What is a good and responsible way to clean a lambda/O2 sensor?

I've got an LSU4.2 lambda sensor (wideband) here that is covered in carbon deposits. It's visible on the outside, so it's probably also present on the inside. The holes aren't blocked yet though, but ...
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1answer
2k views

Can I use the same AFR sensor on both banks (bank 1 sensor 1 and bank 2 sensor 1)

Have 1mzfe (skip this paragraph if you don't want backstory) codes p1135/p1130/whatever the ones for the other bank are/ all showed up at the same, perfect time. ie when I was broke. Since then car ...
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0answers
348 views

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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0answers
722 views

My BMW X5 won't stay running

Hello I have a 2003 BMW X5. I just got the engine replace a couple days ago. I went to pick it up but because the shop was done installing the motor but now I have to deal with the other problems I ...
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3answers
31k views

Can a car operate without a catalytic converter?

So I was reading this Quora question which answers in the affirmative, but here's my misgiving: I was under the impression that the oxygen sensor which the ECU uses to adjust the fuel-to-air ratio, is ...
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2answers
10k views

P1135 code on 2003 Toyota RAV4

I have a Toyota RAV4 2003 and the CEL used to come on and off, but now lately it stay on all the time. I did check with OBD reader and the car had a P1135. I did check the voltage on upstream and ...
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4answers
15k 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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3answers
11k views

P0420 in a Prius

EDIT #2: I rescanned, looking at the correct data, and found the rear O2 sensor was definitely bouncing up and down with the forward sensor's lambda reading. Since I have looked for leaks and couldn'...
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2answers
345 views

My lambda sensor has a collar around it, I can not see how to unscrew it. (2009 Ford Fusion)

I have a Ford Fusion. I am looking at the sensor on top of the exhaust with a collar, and I cannot see how to undo it. I put the image in to show what I'm dealing with. I don't see a way to fit a ...
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1answer
10k views

Oxygen sensor malfunction

2005 Toyota Tundra v8 This truck overheats with no radiator fluid loss. Also had power loss. Motor shake. Codes came back with a voltage high/low and both oxygen sensors upstream needed replacement. ...
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2answers
201 views

Where can I buy the 2005 Mazda 3s 2.3L oxygen sensor plug?

I bought an oxygen sensor with the wrong plug. I wonder were could I buy a plug like the one on my car in order to connect the oxygen sensor properly? This is an image of the plug on my car. Does ...
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2answers
1k views

Find short circuit in your car

I have three engine code on, two for two O2 sensors and one for EGR Value ($350). My mechanic is suspecting a short somewhere. My O2 sensors give almost 0 home resistance when it should give about 6 ...
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2answers
6k views

How do I repair the O2 sensor in a 2001 Toyota Camry?

I have a 2001 Toyota Camry and the O2 sensor near the front of the car is bad (this is confirmed by the code that the computer has returned). Though I'm not particularly knowledgable about cars (...
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1answer
4k 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
9k views

Very high short term fuel trim

I was checking my short term fuel trim numbers and o2 sensor switching speed as I think my post-cat sensor has degraded. The car is not throwing a code, and I don't believe that there's a hole in the ...
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1answer
52 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
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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1answer
2k views

High O2 voltage paired with high LTFT reading

What is likely culprit when O2 pegs at .9 volts and stays there indicating engine is rich. Then as this continues for 15 - 30 seconds, the LTFT eventually climbs to +25% or more. Computer calculates ...
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1answer
1k views

O2 Sensor - 1998 Toyota Camry 2.2L 4-cyl

I was getting a few error messages p1135 being one of them, which seems to indicate that the O2 1st bank 1st sensor should be replaced. My car is 4cyl, so there is only one sensor under the hood (pre ...
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0answers
28 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 ...
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0answers
444 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
109 views

Unresolvable system leak error codes

I have had my mechanic replace multiple components in my EVAP system trying to resolve the following error codes which occur in no particular order within 24 hours after resetting my memory and cold ...
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0answers
1k views

P0420 Catalyst efficiency below threshold bank 1 With CO emission only!

I saw this code in OBD2 scanner on Skoda Fabia 1.2 2006 64hk petrol. It doesn't matter to me except that the car failed the inspection and I'm not allowed to drive it any more. The problem was too ...
3
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1answer
536 views

O2 Sensor on 2005 VW Jetta [duplicate]

I've purchased a Bosch premium O2 sensor kit with SmartLink. It comes with a wiring chart but I have 2 wires that are not on it. My original O2 sensor has a red and yellow wire along with gray and ...
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3answers
682 views

EFI engine car failed Emission test?

i have an EFI engine car (Nissan N16 Super Saloon - 2000yr) i bought it 6monthes ago as an used car. After i bought it, i had check engine lights on, then i drove it to a mechanical shop few times ...
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1answer
2k 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 ...
2
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3answers
41k views

Do engines absolutely need an O2 sensor to function properly?

My understanding is that the O2 sensor's main goal is to get the fuel mixture as close as possible to the stoichiometric ratio of 14.7:1 so that the catalytic converter can function at its peak. But ...
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4answers
8k views

Check engine lights came up after Air filter change?

Yesterday I changed air filters in my car (Nissan supper saloon N16 - model year 2000). After installation the check engine light came on when I started the engine and the engine seemed to be running ...
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2answers
113 views

My Toyota fails under full throttle but not when feathered

My car is a Toyota MK4 NA Supra and it has a problem I don't understand. When I push the throttle gently, whether in park or in drive, it gradually builds revs and moves but when I push it hard i.e ...
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1answer
3k views

Changed O2 Sensor and my mileage went down

I changed the O2 sensor on my 97 Mazda 323 BA 1.8L BP DOCH Lantis and my mileage actually went down. The car had the original sensor in it, with about 200,000 kilometers on it and I replaced it with ...
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2answers
2k 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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1answer
134 views

What would cause those two codes?

I was driving a new car I just got a week ago which is a 2005 Honda Civic HX and suddenly while driving the check engine light illuminated, I got my scanner in and check for the codes and I got those ...
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1answer
2k views

Interpreting O2 sensor readings

I have a 2001 Honda Prelude SH (Honda H22A4 Engine). The exhaust has two oxygen sensors; one before the catalytic converter (sensor 1) and one after (sensor 2). Holding at 2500 RPM and sitting still ...
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1answer
1k views

Low MPG for my Ford Focus 2005

I have been driving this car for some time now (Ford Focus ZX4 2005). I have been seeing 25 - 27 MPG every time I fill up. I drive a little (10 min) in city and then the rest of my destination on the ...
2
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1answer
69 views

2007 Honda Fit Sport P0420

I backed up in a dirt lot and heard a metal scraping sound. After driving about 30 miles, the check-engine light came on with code P0420 indicating "Catalyst Efficiency Below Threshold (Bank 1)&...
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1answer
60 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
2k 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
72 views

Is it possible for the ECM to even attempt hitting the stoichiometric point if the pre-cat O2 sensor has failed?

If the pre-cat O2 sensor fails, the ECM is no longer able to determine whether the mixture is rich or lean. A pre-cat O2 sensor cannot fail silently, the CEL (check-engine light) will switch on. I am ...
2
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1answer
126 views

2000 Honda Accord O2 Heater error

After replacing the O2 sensor due to fault codes 1166 and 1167, I still get 1167-Heater circuit error. I check resistance through O2 sensor heat, about 17 Ohms. Plug has 14 volts feeding heater. I ...
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2answers
580 views

Using dry moly lube as an alternative to anti-seize

While shopping for some anti-seize for my O2 sensor install, I came across some transmission lube that had me wondering about whether I could use it as an alternative to anti-seize. It appears to ...