Does the P0160 (not P0161) oxygen sensor fault cause a loss of engine power in a 2003 Chevrolet Tahoe? I currently have only the P0161 diagnostic trouble code appearing on my vehicle. This code relates to the heater circuit of the second oxygen sensor (post-catalytic converter). I want to understand whether this issue directly affects performance or if it's more related to emissions monitoring.
I have a misfire issue with codes P141, P161, and P1345 on my 1997 Chevrolet Tahoe. I replaced the spark plugs, wires, distributor cap, and rotor. The problem persists — any suggestions for further diagnosis?
P0141 and P0161 are post-catalytic converter O2 sensor heater circuit fault codes. Start by checking the fuses related to the oxygen sensor heater circuits. The P1345 code indicates a correlation issue between the crankshaft position (CKP) and camshaft position (CMP) sensors — they don't agree on cylinder #1's top dead center (TDC). This can be caused by improper distributor timing, a loose distributor hold-down bracket, or a faulty distributor cap. Never manually adjust the distributor as it does not control ignition timing. Use an OBD2 scanner to check the distributor advance (offset or sync), then realign the distributor with proper CKP readings. A YouTube tutorial on P1345 may help. Also, consider using AC Delco spark plugs — third-party brands can sometimes trigger misfire codes.
I'm not sure what 'loss of speed power' means — could you clarify? Is this coming from your OBD2 code reader, or are you using a free scan tool like AutoZone? Make sure the scanner can detect all stored codes and live data.