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2000 Volvo S70 Engine Light On

The Check Engine Light is on. Diagnostic Codes: P0722, P1618, and P1633. Do these mean the output speed sensor/connector wires should be replaced? Is this a DIY job?

Check transmission ground wire, and then check the speed sensor wire. Only replace the wires if they’re actually bad. It could also be a bad transmission speed sensor and have nothing to do with the wires.