Why anyone here buys Bosch anything baffles me.
Aftermarket Oxygen Sensor Causing Hesitation?
- Thread starter good_jolly
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Yet some think their oil filters are the greatest.
There you go!
Originally Posted By: Vikas
I suppose Bosch probably works fine on VW and BMW etc.
Back to OP, are you getting P0420 error code? If so, google O2 sensor extension. You are in TX, you don't even have emissions!
- Vikas
Oh come on, we are just like most other states, high population areas certainly do have emissions testing here. Just looked it up, the following counties have emissions testing required:
Which vehicles are required to have the emissions test?
* Vehicles registered in designated counties. Designated counties include: Brazoria, Fort Bend, Galveston, Harris, Montgomery, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, Travis, Williamson and El Paso counties.
I suppose Bosch probably works fine on VW and BMW etc.
Back to OP, are you getting P0420 error code? If so, google O2 sensor extension. You are in TX, you don't even have emissions!
- Vikas
Oh come on, we are just like most other states, high population areas certainly do have emissions testing here. Just looked it up, the following counties have emissions testing required:
Which vehicles are required to have the emissions test?
* Vehicles registered in designated counties. Designated counties include: Brazoria, Fort Bend, Galveston, Harris, Montgomery, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, Travis, Williamson and El Paso counties.
I'm glad I found this thread; I put a Bosch O2 in my 94 Toyota Corolla and immediately noticed part throttle hesitation. Put the stock one back in and it runs fine. I'll order a Denso. I've had such [censored] luck recently with aftermarket parts I should just only use OEM, but it's a PITA to get OEM parts in a pinch.
Ya I have a PO420 code on a 03 forester and the original O2 sensors (143k miles) so I figure I need them regardless.
I was going to get the bosch ones but I'm glad I read this thread first. Going to get denso instead.
I was going to get the bosch ones but I'm glad I read this thread first. Going to get denso instead.
Originally Posted By: CROWNVIC4LIFE
Why anyone here buys Bosch anything baffles me.
Bosch spark plugs are terrible in many cars, usually the ones that didn't have them from the factory. Everything else that Bosch makes is good quality. Bosch O2 sensors are good and so far have worked in every car I put them one. One even has 130K miles in it. In a Toyota I do put in Denso O2 sensors though. Everything else get a Bosch. If you think Bosch sucks, you need to stop driving Toyotas.
Why anyone here buys Bosch anything baffles me.
Bosch spark plugs are terrible in many cars, usually the ones that didn't have them from the factory. Everything else that Bosch makes is good quality. Bosch O2 sensors are good and so far have worked in every car I put them one. One even has 130K miles in it. In a Toyota I do put in Denso O2 sensors though. Everything else get a Bosch. If you think Bosch sucks, you need to stop driving Toyotas.
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I got a Denso for my Corolla; back to running good. I can't believe how [censored] the Bosch made it run. Maybe it's because the Denso is twice as long; the Bosch barley made it into the exhaust stream with how Toyota does their O2 bungs.
Sometimes you get lucky and Bosch repackages a Denso sensor and sells it under its own name. If you get a Made In Japan, Bosch sensor, then it more likely to be a Denso inside. At least I managed to snag a Denso underneath when I purchased a Bosch Air/Fuel ratio sensor from Advance Auto with the discount. That was calculated gamble based on internet research. I paid almost half the price of a Denso branded sensor for the Toyota Camry.
It sounds like you broke something when you sat on the engine. Probably some broken hose and/or vacuum leak. I doubt its the new oxygen sensor.
Originally Posted By: Gokhan
It sounds like you broke something when you sat on the engine. Probably some broken hose and/or vacuum leak. I doubt its the new oxygen sensor.
Large vacuum leaks or vacuum leaks that easily find their way into the intake manifold will cause large hesitation.
Once the adjustment screw had fallen off from my choke-breaker diaphragm, causing a large vacuum leak, which caused large hesitation. In that case, it would even hesitate on the highway at high speeds. When I put a new adjustment screw, I covered it with adhesive silicone to prevent it from falling off again. More interestingly, I have this high-altitude compensation system built into the carburetor feedback system that also includes the oxygen sensor. The idea is to bleed more air into the carburetor when the air pressure drops at high altitudes. Whenever I went to Las Vegas, the system would prematurely kick in, even though the elevtation of Las Vegas isn't that high. It was just bleeding too much air into the carburetor. It was really annoying, engine would almost stall. One morning at the hotel parking lot, I removed the air-filter cover on the altitude compensator and then the filter material and tapped on the bellows that senses the air pressure. Guess what -- all was fine afterwards, hesitation completely gone for good and the engine as smooth as it can be at low throttle! It was apparently some stuck bellows. Perhaps it was a loose or leaky hose as well that I fixed when I was working on it.
There is a chance that oxygen sensor can cause it as well, if it thinks that the mixture is too rich and you need more air. There are ways of testing the oxygen sensor. You can put the old sensor back and see if the problem goes away. However, it sounds more like vacuum leak or a broken part somewhere, which may have happened when you sat on the engine. Check old the hoses or parts that might have got damaged when you were doing the repair.
It sounds like you broke something when you sat on the engine. Probably some broken hose and/or vacuum leak. I doubt its the new oxygen sensor.
Large vacuum leaks or vacuum leaks that easily find their way into the intake manifold will cause large hesitation.
Once the adjustment screw had fallen off from my choke-breaker diaphragm, causing a large vacuum leak, which caused large hesitation. In that case, it would even hesitate on the highway at high speeds. When I put a new adjustment screw, I covered it with adhesive silicone to prevent it from falling off again. More interestingly, I have this high-altitude compensation system built into the carburetor feedback system that also includes the oxygen sensor. The idea is to bleed more air into the carburetor when the air pressure drops at high altitudes. Whenever I went to Las Vegas, the system would prematurely kick in, even though the elevtation of Las Vegas isn't that high. It was just bleeding too much air into the carburetor. It was really annoying, engine would almost stall. One morning at the hotel parking lot, I removed the air-filter cover on the altitude compensator and then the filter material and tapped on the bellows that senses the air pressure. Guess what -- all was fine afterwards, hesitation completely gone for good and the engine as smooth as it can be at low throttle! It was apparently some stuck bellows. Perhaps it was a loose or leaky hose as well that I fixed when I was working on it.
There is a chance that oxygen sensor can cause it as well, if it thinks that the mixture is too rich and you need more air. There are ways of testing the oxygen sensor. You can put the old sensor back and see if the problem goes away. However, it sounds more like vacuum leak or a broken part somewhere, which may have happened when you sat on the engine. Check old the hoses or parts that might have got damaged when you were doing the repair.
It has been said numerous times already - Toyota and Bosch do not mix well.
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