I've got an annoying Error code, I had a P0135[02 Sensor Heater Circuit] and a P0030[HO2S Heater Control Circuit], so I replaced the upstream o2 sensor. This fixed the P0135[02 Sensor Heater Circuit], but I'm still getting the P0030[HO2S Heater Control Circuit] error, and to top it off I also got a new code, P0321[Ignition/Distributor Engine Speed Input Circuit Range/Performance]. This was the first time I've really done any mechanical work, so is it possible I fucked it up somehow? Any advice would be greatly appreciated.
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