Originally Posted By: Trav
If the Bosch are direct fit they are probably the OE manufacturer for Ford anyway.
Don't believe stuff about only these for Japanese and these for Germans and those for Fords its absolute nonsense.
We have used Bosch, Walker, AC Delco, Denso, NTK, BERU, in all sorts of cars and never had any problems. All are maintaining nice fuel trims over many years and miles.
According to Rockauto, Bosch is "OE Style Oxygen Sensor", I think it is a direct fit.
But there is some confusing about pre and post Cat sensors. Bosch and Denso have different sensors part numbers for the rears.
Bosch has 1 sensor Part# 15716 for Upstream and
Downstream Left, another sensor Part# 15717 for Downstream Right.
Denso has 1 sensor Part# 2344046 for Upstream, 1 sensor Part# 2344610 for Downstream Left and 1 sensor Part# 2344609 for Downstream Right. All these sensors are for Engine VIN K, What is this Engine VIN K ?
Originally Posted By: Trav
The only problems i ever had was with a universal, i refuse to use them.
Keep the rear O2's as long as they don't throw a code, they are just cat monitors. In an older vehicle a slightly lazy monitor can be helpful in keeping PO420/430 away.
Edit: I should mention i have also used Standard and a few others all without problems.
Many times the O2 get blamed for underlying issues. The most common real O2 failure is in the heater circuit.
I have no idea what is the O2 heater circuit and where it is located.
As of now I think he just needs to replace O2 sensor(s) and hope that the CEL will not come bcak for few years.
Originally Posted By: cbear
I had the same issue on my Nitro. The Nitro uses the same sensor for all four positions. I decided to buy two new sensors. I pulled the bad post cat sensor and threw it away. Then I pulled the old good pre cat sensor from the same side, and installed it in the post car position. Then I put the new sensors in both pre cat positions. The pre cat sensors are doing all the adjustments. The post cat sensors are just verifying that thee cats are working correctly.
Good recommendation here.
Since the failure is Passenger Rear (Downstream Right) and it is a unique sensor (probably longer wire length), I think replacing 2 pre-cat sensors and right post-cat will be okay, keep the 2 good pre-cat sensors in case the Driver Rear (Downstream Left) gives CEL in near future.
Or just replace Passenger Rear (Downstream Right) for now and worrying about other sensors when CEL is on.
If this was my SUV I would prefer former option to save time(and possibly labor cost), but it isn't and my friend may not understand why replace O2 sensors that didn't give CEL.
Thank you all for your inputs and advices.
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