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Old 02-20-2014, 08:34 PM   #1 (permalink)
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Question '06 Reno Oxygen Sensor/Cat Converter problems

Hello!

Last winter I bought a 06 Reno for my high school daughter to get around this school year. Engine light came on two weeks later.

1. It coded oxygen sensor. After changing that (Feb '13), it coded again. Ignored it, seemed to run rich, sometimes reved when it shouldn't. Once it stopped accelerating while being driven.

2. Had the catalytic converter ($200, ebay part) and oxygen sensor done April '13. And it coded a week later. Started revving sometimes again, sometimes acting like it wasn't getting enough gas and every so often needing to pull over and turn it off because it stopped accelerating while being driven - I'd press the gas and it would not respond at all. But most of the time it ran, even if it was running rich and louder.

3. Found a different mechanic. Changed the converter ($350, mechanic swears by this company's converters) and sensor ($200) again, Dec '13. One week later, warm day (Georgia) - engine light goes on, then it stops accelerating while being driven. Pull over, turn it off, wait a min, turn it back on, it goes. Today my daughter was having to pull over every two miles to turn it off and wait. She got it to our tire guy and it's coding oxygen sensor again!

How many oxygen sensors does this thing really have? (2006 Suzuki Reno Parts - Suzuki Car Parts Catalog Online Store)

Should the code say which oxygen sensor, or should both (or all four?) sensors be changed at the same time?

Is something else burning out the sensor(s) and converter?

I've seen other examples similar on the net (Clo Overcast's Garage | Recent Activity - CarGurus) but no one reports back what they discover the problem to be - unless they are like me and can't get the problem to fix?

Ideas, help? Thank you!
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Old 02-20-2014, 10:36 PM   #2 (permalink)
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hi Freebird61 welcome to the forum!! the car has two O2 sensors, bank one and bank two or upstream and downstream. theres one right off the engine and one under the car. when they check the code it should tell them which one it is. im not a mechanic but it seems to me that your problem is neither your cat or your o2 sensors. the problem is whatever is making the the sensors read wrong. ok first things first, when do the rpm's jump erratically? is it at idle like at a stop light or when you first start the car? now can you check a couple of things? how is the antifreeze level? is it low? also if you can id like you to check the spark plugs. before you pull them look into the hole, is there any oil covering the plugs? ok, last thing, open the oil cap. how does the oil on the underside of the cap look? normal and dark or does it look a little milky? now pull the oil dip stick. how does the oil on the end of that look, normal and dark, maybe a little clear depending on how new the oil is, or does it look milky at all? depending on what you info you tell me regarding the questions i asked, heres what im thinking, its a bad sensor. since you have no backfire code coming up im guessing it might be your map sensor, or a dirty IAC sensor. my first guess would be a faulty map sensor, manifold absolute pressure sensor, given the surging and wanting to stall out. the map sensor help to decide how much air and fuel get put into the engine. if its not working properly i would think it could cause the O2 sensors to pop a code. remember though im not a mechanic so you should either have it checked or change it yourself. we can help with that if you need instructions. also let us know what you find out checking those things. any other questions just ask
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Old 02-21-2014, 07:40 AM   #3 (permalink)
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Hi 7-even, thanks for the reply. I won't be able to check those things you told me to check until Monday or Tuesday when I'm back in the town my daughter lives in (I moved two towns over, 45 min away). She's a college kid now...

The Reno is more likely to rev or run rich than to run weak. It never sputters or stalls, will just run weak, like going uphill and I know I can pass the semi hauling stuff uphill so I pull out and punch it annnnddddd.....no can't pass it after all because it's not giving it the gas fast enough. Other times I can race past that slow semi. The revving will sometimes be while stopped at a red light. Mostly though while driving, but not giving it gas, it will rev (as if it were thrown into neutral and the gas pressed hard)! (The ghost in the machine...)

It doesn't matter if it's a cold day, warm or hot. It's done it on all kinds of days and temps, and it's also run just fine on other days.

I thought it's as if there was a fuel valve sticking and opening at the wrong times. The map sensor would make sense - I had one go bad in an Astro van a decade ago that gave me fits. (I miss my first little 74 truck I had as a teen where I could just get my mechanic friend to adjust the carb!)

Do you think I should change out the other oxygen sensor first before trying anything with the map sensor? (I will go to autozone and have the exact codes pulled first)

Oh, look at this: Lack of Power Due to Failed MAP Sensor : Suzuki Reno Common Exhaust & Emissions Problems "A lack of power concern may develop accompanied by illumination of the Check Engine Light and several fault codes stored. This condition may be caused by a failed MAP sensor which will require replacement with an updated part."

There is also this: PCM Software Update Available : Suzuki Reno Common Exhaust & Emissions Problems "A Powertrain control module (PCM) software update as available to correct illumination of the Check Engine Light due to slow oxygen sensor response time."

How does one get a software upgrade to a Reno - is that always a dealer thing? :-p

Does the Reno not throw a code for the map sensor, or is this something it does special for just a few Renos/suzukis?

Thanks! Freebird61
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Old 02-26-2014, 01:51 AM   #4 (permalink)
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hi sorry for the late reply ive been laid up sick. i really dont think its the 02 sensor but you can change it if you want to. you could have the o2 sensor checked. i think they test the voltage output on it or something to see if its working correctly.
to get a software update you need to go to the dealer. i think thats the only place that can do it right now.
well the car will throw a code for the map sensor but it might not be until its gone bad lolol. if the map is your problem, its still working at least part of the time so the ecu might not have picked up on the problem yet. the ecu checks the system using drive cycles. it checks different components based on certain parameters. for example the drive cycle may be starting the car and driving 30 miles. if the map sensor is fine during the time it takes to complete the cycle the car considers it working fine until the next cycle is finished however long that takes. the sensor might not be acting up enough to trip the warning light yet. youd really have to go into the mechanic and see what they think. these are just guesses really, without being able to see the car most of these things are. let us know what you find out
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Old 02-26-2014, 02:14 AM   #5 (permalink)
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if interested heres the link to the online service manual. it has definitions of all the trouble coded and even some diagnosis. if you want to take a look and see if what your cars doing matches anything in the book heres where to go.
first click on the service manual folder, then click on the engine folder, then click on engine controls, then you can look at the trouble code diagnosis section or the symptom diagnosis folders. have a look around you may find something helpful
Daewoo Service Manual
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