1994 ZR1 Code H64 - ZR-1 Net Registry Forums

Zedder94 · 08-02-2022

Hi guys,

Wanted to reach out to you all and ask a couple questions. My 94 ZR1 is throwing a H64 code (As you all know - RHS Front O2 sensor lean). It will come in after it has warmed up and goes into closed loop operation, approx 10 minutes of driving. The car has 63K miles. No rough idle or rough running through the rev range.

From my research i was going to replace the RHS O2 sensor (prior to the CAT) After getting under the car the O2 sensor is in a shocking position to access! Any info or secrets on getting to the sensor? I was thinking of dropping the CAT to do so. I cannot see any other way.

I was thinking the O2 sensor would be the easiest try at fixing the code, I have read on here that injectors could cause it also. Wanted to change out sensor prior to injectors.

Any info is appreciated fellas. Cheers,

Jay.

08-02-2022	#1
Zedder94 Join Date: Jun 2022 Location: Arroyo Grande CA Posts: 8	1994 ZR1 Code H64 Hi guys, Wanted to reach out to you all and ask a couple questions. My 94 ZR1 is throwing a H64 code (As you all know - RHS Front O2 sensor lean). It will come in after it has warmed up and goes into closed loop operation, approx 10 minutes of driving. The car has 63K miles. No rough idle or rough running through the rev range. From my research i was going to replace the RHS O2 sensor (prior to the CAT) After getting under the car the O2 sensor is in a shocking position to access! Any info or secrets on getting to the sensor? I was thinking of dropping the CAT to do so. I cannot see any other way. I was thinking the O2 sensor would be the easiest try at fixing the code, I have read on here that injectors could cause it also. Wanted to change out sensor prior to injectors. Any info is appreciated fellas. Cheers, Jay.