Koumas did force Jehle into a good save driving low from 25 yards just after the hour.
But Wigan kept chipping away, with Zaki's header from Koumas' cross just shaving the wrong side of the post.
Miroslav Klose put the visitors ahead with just five minutes on the clock after Jason Koumas had lost possession.
Agaev had earlier saved Jason Koumas' awful penalty and Fabio Luis Ramim was dismissed after receiving two yellow cards.
But when Paul McShane was ruled to have tugged down Welsh sub David Cotterill it gave Koumas the chance to level.
It was a sixth goal in 25 international appearances for Koumas who had been left free by a slack Irish defence.
Wales' Jason Koumas had earlier missed a penalty against the ten-man Azeri.
Despite his on-going predicament, Koumas has been named in the Wales squad for the friendly against Bulgaria in Swansea on 15 August.
Koumas' cross found Aghahowa three yards from goal, but the striker somehow managed to head wide with an open goal to aim at.
However, there was reassurance for Koumas' Wales team-mate Rob Earnshaw that the striker has a big part to play in Robson's West Brom plans.
BBC: SPORT | Football | My Club | West Bromwich Albion | Koumas faces bleak Baggies future
The Brazilian-born Ramim had earlier been booked for elbowing Bale and was shown the red card in the 68th minute for holding back Koumas.
It was the only real talking point of an opening that lacked any tempo with Jason Koumas and Gareth Bale restricted to long-range efforts.
Ramsey's return to south Wales is a huge boost to Jones' creative midfield options as Cardiff are currently without injured pair Stephen McPhail and Jason Koumas.
Jason Koumas began to exert more influence in midfield and the Wales international forced Reina into his first save of the game in the 51st minute.
Hugo Rodallega's stunning strike and a second-half goal by Jason Koumas secured the points for Wigan, with Villa struggling to create chances in the opener.
Koumas scored his second from the penalty spot in the 89th minute after McShane's clumsy challenge on Cotterill to give Wales some slight comfort from a disappointing campaign.
Koumas delivered a low cross from the left across the face of goal but the Wolves striker could not make contact as he dived in from close range.
The Latics boss Steve Bruce replaced Mario Melchiot with the more attack-minded Jason Koumas at the interval and the visitors made a blistering start to the second half.
BBC: SPORT | Football | Premier League | Sunderland 2-0 Wigan
Wales - missing Craig Bellamy, Jason Koumas and Gareth Bale - also needed a slice of luck after 14 minutes when Germany came within inches of taking the lead.
With the hosts missing the experience of Craig Bellamy, Simon Davies, James Collins and Jason Koumas, manager John Toshack had little option but to put his faith in youth.
The Irish, needing a victory in their attempt to come third in the group, had fought back to lead after Koumas had headed Wales in front on 23 minutes.
As well as the surprise capture of Wales captain Bellamy, midfielders Jason Koumas, Seyi Olofinjana and Danny Drinkwater have all arrived for the season on loan from Premier League teams.
Gary Speed, Robbie Savage, Mark Delaney, John Hartson, Mark Pembridge, Andy Melville, Ryan Giggs and Jason Koumas have all quit Wales since Hughes left to take over at Blackburn in 2004.
Wigan grabbed an equaliser, their first goal in four games, when Koumas jinked down the left touchline to cross precisely for Paul Scharner to head home powerfully at the back post.
N'Guessan deservedly pulled them within touching distance in the 73rd minute with a powerful header, but any hope of an unlikely point was short-lived as Olofinjana diverted Jason Koumas' goal-bound effort home.
But it was that man Evans that almost laid on a second for Wales as the young tyro set up second-half skipper Jason Koumas, whose 25-yard volley fizzed inches over Sturluson's crossbar.
Ramsey is Jones' seventh loan signing this season - joining Bellamy, Koumas, Emmanuel-Thomas, Olofinjana, Danny Drinkwater and Andy Keogh - although the club can only include five loan players in a matchday squad.
It was important for Wigan to capitalise on their period of intense pressure but they were denied by the woodwork once more when Heskey's header from a Koumas cross rebounded off the bar.
BBC: SPORT | Football | Premier League | Sunderland 2-0 Wigan
Bruce's men bombarded the Sunderland penalty area with crosses and, following Murphy's wonder-strike, they would have reduced the deficit, only for Gordon to save fantastically after Emmerson Boyce headed Koumas' corner towards goal.
BBC: SPORT | Football | Premier League | Sunderland 2-0 Wigan
Koumas, who manager John Toshack had identified as his main playmaker now Ryan Giggs has retired, lost the ball inside his own half, giving striker Kevin Kuranyi a clear run at the retreating Wales defence.
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