* Yen moves higher after sinking on officials' intervention talk

* Aussie resumes slide after crude oil's about-face

* Kiwi soars after RBNZ opts to refrain from steps to cool housing

By Lisa Twaronite and Ian Chua

TOKYO/SYDNEY, May 11 (Reuters) - The dollar dipped on Wednesday as investors locked in gains following its steep rise against the yen after intervention warnings from Japanese officials.

The dollar index, which tracks the greenback against a basket of six rival currencies, shed 0.2 percent to 94.126, moving away from its two-week high of 94.356 set overnight.

However, it remained well above a 15-month trough of 91.919 set on May 3.

The dollar fell 0.4 percent to 108.83 after climbing to a two-week high of 109.38 yen early in the Asian session. It moved back toward last week's low of 105.55, which marked its lowest since October 2014.

The euro slipped about 0.3 percent to 123.90 yen after notching a two-week high of 124.415 overnight after bouncing off a three-year bottom of 121.48 on Friday.

Both currencies had suffered losses in late April when the Bank of Japan held off from expanding monetary stimulus, touching off a rally in the yen that stoked investors' fears that Japan's Ministry of Finance would decide to intervene.

Still, many expect that Japan would be wary of conducting direct currency intervention before it hosts a G7 meeting later this month, as Tokyo is sensitive to criticism that it is trying to engineer a weaker yen.

"Japan can't intervene so easily," said Ayako Sera, market strategist at Sumitomo Trust and Banking. "But the recent comments from officials provided investors with good timing to unwind some of their long positions."

Koichi Hamada, a key economic adviser to Prime Minister Shinzo Abe, was the latest to sound a currency market warning.

Hamada said on Tuesday Japan will intervene in foreign exchange markets if the yen strengthens to 90-95 per dollar, even if that upsets the United States.

"Yesterday's comments from Japanese officials hinting at possible FX intervention to weaken the JPY, combined with the lift in European and U.S. equity markets have undermined JPY," noted Elias Haddad, currency strategist at Commonwealth Bank.

Still, recent dovish comments from core Federal Reserve members and weaker-than-expected job gains in April continue to cap the dollar.

The euro added 0.1 percent to $1.13810, though it remained below a 2016 high of $1.16160 hit on May 3.

The Australian dollar slipped about 0.1 percent to $0.7357 moving back toward a two-month low of 73 cents touched on Tuesday, as oil prices gave up their overnight gains.