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Discussion Starter · #1 ·
I have a 99 V70 2.3 turbo. Engine check light on, my code reader gives me the following P0030 H02S Heater Control Circuit (Bank 1 Sensor1) Linked to ISO 9141. Volvo Service suggests oxygen sensor (front?) but says bring it in for a diagnostic test ($132). Noticed a drop in milage recently....Advice please

Also while stopped, engine running in drive, a vibration and low/rumble noise occurs. When placed in neutral the noise lessened. Could be engine mount, but which one?
 

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9 times out of 10 when you have a trouble code for a heated oxygen sensor it usually means a fault with the heater for that sensor. That code would usuallynot require a diagnostic check to be run, it pretty much means that sensor is bad. This may affect fuel economy but very little.

The vibration/low rumble is hard to say, you'll have to inspect the lower engine mounts or right side engine mount when you're replacing the O2 sensor.
 

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Discussion Starter · #3 ·
Thanks, Is there a way to tell if it's the front O2 or the rear O2. On this V70 the rear was changed in 2006. IPD sells a special tool to remove the sensor, is this necessary.* Finally, Searching some suppliers, i noticed there is quite a difference in cost for the O2 sensor, from about $30 to $200, any advice here?
 

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According to your trouble code that reads Bank 1 Sensor 1, that would indicate front O2, or pre-cat. The special tool is probably a slotted socket that allows the harness to hang out from the socket so it can be fully seated on the sensor to be removed. As far as the cost difference, I would personally be very wary of buying the $30 option. I would personally go to the dealer, spend the extra money, and get the right part with a good warranty that you won't have to replace again in 6 months.
 

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Discussion Starter · #5 ·
Thanks 'rfilori' I'll take your advice and have Volvo do it......I do have a 15% discount card and you are right, they will put the right one in and warrant it for a time. I'm getting too up in age 67 to work on this volvo anyway.
 

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Discussion Starter · #7 ·
Called Volvo service and they quoted over $500 for parts and labor to replace the front O2 sensor. Wow, that's a bunch just for a small , seemenly easy to change part. Volvo charges $300 for the sensor. IPD who I trust over the years sells a Bosch replacement for around $200. Were you suggesting I get the part from Volvo and install it myself? Any advice on precautions for installing myself?
 

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Well rfilori knows better than me, but my experience has been that Volvo's don't like the 'universal' O2 sensor. The extra $100 may be worth the aggrevation. Just my 2 cents.
 

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Regarding the part, the Bosch may be ok if it's the same one as Volvo uses, but that would be almost impossible to know for sure. I would personally buy the part from Volvo. Regarding labor, it is something you can do yourself but it's not very fun, you need to get under the car and it's kind of a pain even with a lift. You may want to get a labor only quote from an independent repair shop to try to save a couple of dollars. It really makes it a pain if you don't have that slotted socket I previously mentioned.
 

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Discussion Starter · #10 · (Edited)
V70 O2 Sensor replacement

Today I installed a Bosch front oxygen sensor in my V70 2.3 turbo. Installation of the sensor into the exhaust went fine, However I could not figure out after many tries how to connect the wiring harness. There is small piece of plastic that evidently snaps into place when the connectors are in place. Access to the area where the connection is made is very limited and blocked by the turbo intake from above. It appears that I could get access from under the hood by removing the air filter assembly, but even that appears to be a chore. Underneath the car access is also limited or my hands are too big. Any advice.....Well I tried to remove the air cleaner housing to gain access to the O2 sensor connectors. Seems to me if I could do this including the exit air tube, I could get access. The air tube has an adjustible metal band where it connects to the air cleaner cover, but it seems frozen to the cover. Then to remove the lower part of the housing there are two plastic spring like pegs that hold it to the body. This is the first time I have been stumped by a Volvo Repair. Rfilori was right I should have taken it to Volvo service, smile and pay the $500 plus to replace the O2 sensor.....but like most of you I'm convinced I could complete the repair with some help from the Volvo Forum Thanks
 
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