mantiss
Test Drive
- Location
- Kennesaw, GA
I have an annoying O2 sensor code P0133 "O2 Sensor Circuit Slow Response Bank 1 Sensor 1" plaguing since Dec. 2022. At that time I was getting two codes (P0133 and P0031) and switched the sensor with the B2S1 to see if it was the sensor. Sure enough, the codes switched to Bank 2. Great! I bought a new O2 sensor, and voila! I passed the emissions test. A few months later, I started getting the P0133 code again (remember this was the good one from the B2 side). This time I noticed a leaking rocker (i.e., cylinder head) gasket because the O2 sensor wire was saturated with the leaking oil. So I replaced both LH and RH rocker covers/gaskets with new "Mitzone" red aluminum covers/gaskets. I inspected all the hoses and replaced the rock-hard PCV blowby hose. After installation tested (using DIY soapy water) all hoses and joints for leaks.
My mileage on a full tank shot up from a dismal ~276 miles to ~378 miles instantly. The Service engine light was finally clear and of course, after a week and a half, the pesky P0133 code came back. I upgraded my OBD II to the Launch CR529 tool and found two specific failures for B1S1 (see images attached for tests Id's 87 & 88). I wish the test details and meanings were better explained.
So, I will be replacing the O2 sensor, but wanted to get any advice on what to check for, just in case something else is causing the upstream sensor(s) when attached to B1 to fail--twice.
My mileage on a full tank shot up from a dismal ~276 miles to ~378 miles instantly. The Service engine light was finally clear and of course, after a week and a half, the pesky P0133 code came back. I upgraded my OBD II to the Launch CR529 tool and found two specific failures for B1S1 (see images attached for tests Id's 87 & 88). I wish the test details and meanings were better explained.
So, I will be replacing the O2 sensor, but wanted to get any advice on what to check for, just in case something else is causing the upstream sensor(s) when attached to B1 to fail--twice.